Experienced and professional animal trainer provide their insights in answering this question :
A. There are more than one disease that can cause this (renal failure, tumor) but the most common one with these specific symptoms is hyperthyroidism. take your cat to the vet to test his thyroid function, if it’s positive it’s treatable using medications.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

Well-recognized causes of weight loss in old cats include chronic renal disease, diabetes mellitus, hyperthyroidism, inflammatory bowel disease (IBD), exocrine pancreatic insufficiency, and dental problems, to name a few.
The causes of unintentional weight loss in cats range from simple lifestyle changes to serious illness. Any noticeable weight loss in your cat warrants a visit to your veterinarian to rule out serious health conditions. They will be able to run the necessary tests to determine what might be at the root of the problem.
Weight loss but still eating can also be caused by inflammatory bowel disease, which commonly alters the way that nutrients in the food are absorbed.” Your cat may also be drinking a lot and losing weight, which can be a sign of chronic kidney disease or diabetes mellitus.
Hyperthyroidism. If your cat is eating more than usual, but still losing weight, hyperthyroidism could be another culprit as well. This happens from a benign tumor that`s being produced by hormones on the thyroid gland.
Older cats tend to be less active and playful, they may sleep more, gain or lose weight, and have trouble reaching their favorite places. Don`t chalk up health or behavior changes – often gradual – to old age, however.
There are two main causes for a skinny cat: Either they aren`t eating enough, or they`re expending more calories than they are taking in. They may not be eating enough due to stress, dental disease, nausea or a host of other reasons.
As they progress through to 12 and 15 years old, cats lose more lean muscle mass and fat, so they start to look thinner. The exact reasons why are unclear, but keeping your older cat on the same food might play a role.
According to the American Association of Feline Practitioners (AAFP) Senior Care Guidelines, older cats are classified as mature or middle-aged at 7 to 10 years old, as senior cats at 11 to 14 years old, and geriatric from 15 to 25 years old.
Signs that your cat is in pain and may no longer have a good quality of life can include: not eating or drinking. vomiting. difficulty breathing.
Older cats tend to lose weight after 12 years from sarcopenia. The best diet for bony older cats is high calorie and protein wet food. To find out how much to feed your senior cat, use a BCS. Weigh your cat and use an online calculator to find out how much to feed them.
The most common sign of hyperthyroidism in cats is weight loss despite an increased appetite. Other common signs include vomiting, diarrhea, hyperactivity, drinking and urinating more than normal, and an unkempt hair coat. Because the disease develops gradually, signs are often easy to miss at first.
The average lifespan for a pet cat is probably around 13 to 14 years. However, although their lifespan varies, a well cared for cat may commonly live to 15 or beyond, some make it to 18 or 20 and a few extraordinary felines even pass 25 or 30 years of age.
Indoor cats generally live from 12-18 years of age. Many may live to be in their early 20s. The oldest reported cat, Creme Puff lived to be an amazing 38 years old. Outdoor cats generally live shorter lives due to being more likely to be involved in traumas such as motor vehicle accidents or dog attacks.
It`s essential to know how much egg is appropriate for a cat. While a single egg is a relatively low-calorie, high-protein snack for a human, the high fat content of eggs can cause your cat to gain weight if the correct portions are not adhered to.
You should be able to feel your cat`s ribs, spine and hipbones quite easily but they shouldn`t stick out. Feel the base of your cat`s tail. There shouldn`t be any build-up of fat where the tail meets your cat`s back.
Eggs are not only a perfectly safe food source for cats – they offer much in the way of nutritional benefits. Aside from being rich in protein, eggs are also a great source of linoleic acid, Vitamin B2 and B12 and water-soluble Vitamin A – all of which are wonderful for your cat`s skin and coat.
Even though there are classic signs of diabetes in cats, other diseases can act the same way. Kidney disease, an overactive thyroid gland, liver disease and urinary tract infections can all have similar presenting signs and look the same outwardly to the veterinarian.
In cats with severe or uncontrolled diabetes, the breakdown in fat and muscle can lead to a further syndrome called ketoacidosis which, if left untreated, will progress from vomiting, diarrhoea and severe dehydration to coma and death.
Feel Around Your Cat`s Spine

Again, you should be able to feel the bones, but not excessively. If the vertebrae feel very knobbly or like there`s nothing on top of them, you have a thin cat and they`re underweight. If they`re difficult to feel, your cat`s fat and you have an overweight cat.

As a general rule, if these bones are too prominent, it could be a sign that your pal is underweight or malnourished. On the other hand, if you cannot feel any of these bones because they are hidden under a thick layer of fat, then there`s a good chance that your cat is overweight.
Weight loss can be an early sign of illness, so check with your vet. It is common for older cats to develop medical conditions that cause them to lose weight, such as kidney and thyroid disease. If your cat is losing weight, it is important to consult your vet as soon as possible.
The most common reason older cats begin drinking and urinating excessively is because their kidneys are starting to decline. The kidneys are responsible for filtering the blood and producing urine. As cats age, their kidney function decreases.
The rule of thumb is that at about age 7, a cat is considered to be middle-aged. At age 10 and above, a cat is considered to be in old age. As you can see, a seven year old cat is well into middle-age.
Cats that are ill will usually show changes in overall appearance, energy level, sociability, coat appearance and/or amount of shedding, appetite, litterbox usage, breathing, or discharges from the eyes or nose. In general, any sudden change should alert you that your cat needs veterinary attention.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. Why do cats meow?
ANSWER : A. Cat parents often wish they could better understand what their favorite feline friends want or desire. A cat’s meow can be interpreted in many different ways and can indicate an array of feelings and needs. Here are some of the most common reasons for your cat’s vocalizations:

1. Greeting- Many cats will meow as a greeting when you enter your home or walk into a room. Cats will also meow at another cat or animal in the household to extend a hello and acknowledge the other animal’s presence.

2. Attention – An exuberant meow followed by leg rubbing or another attention seeking behavior may indicate your cat is looking for some quality time spent together. Some petting or rubbing behind the ears may be in order.

3. Hunger – A meowing cat is often a hungry cat. This is one of the most common reasons for a cat to vocalize to their owners. A cat will meow to get your attention at feeding times or even when they want extra food.

4. Sickness – A sick or hurt cat may begin to meow excessively, warranting a visit to the veterinarian. There are numerous reasons for a cat in distress to meow—whether it is related to an upset stomach, an injured leg or a urinary blockage. These meows should be carefully investigated.

5. Entering or leaving – Most cats will vocalize when they want to be let in or out of a room. You may notice when you are in the bathroom or behind the closed door of a room that your cat begins to meow, scratches at the door, and often reaches its paw under the door. This is a clear indication that the cat wants to be where you are.

6. Angry – An agitated cat may meow to warn their owner or another household pet that they are upset and would like to be left alone. This angry meow may increase in sound volume as the cat becomes more stressed or agitated. Often a cat will exhibit this type of meow at the veterinary office when they are unhappy with their examination or restraint.

Each feline is different and so are their vocalizations. Learn to understand the variety of meows your cat uses on a daily basis. This will help you develop a better relationship with your cat and help them live a more trusting and happier life.

Q. my half Persian 12 year old cat has lost a substantial amount of weight eating lots and drinking lots quite smelly and has thinning hair,
ANSWER : A. There are more than one disease that can cause this (renal failure, tumor) but the most common one with these specific symptoms is hyperthyroidism. take your cat to the vet to test his thyroid function, if it’s positive it’s treatable using medications.

Q. How do I determine how much my overweight pet should weigh?
ANSWER : A. There are many tools to determine overweight and obesity levels in pets. A new tool, morphometric measurements and body fat index, are available to accurately determine a pet’s ideal weight; this will allow an accurate determination of the amount of food a pet should receive to achieve weight loss. Feeding the correct amount will lead to greater weight loss success.

There are many weight loss food options to help pets reach their ideal weight. Your veterinarian can help make a ideal weight recommendation. Here are some tips to help your dog lose weight in a healthy and safe way:

1. Diet: Providing a healthy and well balanced diet is essential to your pet’s overall health. Finding the right food for your dog can be a challenging process. For those overweight animals many commercial dog companies offer weight loss diets, but it is important to evaluate food labels for adequate nutritional content.

You want to ensure you are not missing other essential vitamin or mineral content. Volume of food is also important and the amount of food that works for one breed of dog may not be the same for another breed of dog. Portion control as opposed to free-choice feeding can help your dog to drop a few unnecessary pounds.

There are also prescription weight loss foods designed by veterinary nutritionists, such as Hill’s r/d (http://bit.ly/1AoENSd). Some pet owners find that home cooking is the best option for helping to provide a well-balanced and realistic diet plan. There are websites such as balanceit.com that offers recipes to fit your dog’s specific needs. Consulting with your veterinarian or a veterinary nutritionist to find the appropriate diet is a great way to help your dog be as healthy as possible.

2. Exercise: Another great tactic for weight loss for your dog is exercise. Whether this is through running, walking or playing with a favorite toy all of these are wonderful types of exercise to help keep your dog at a lean and healthy weight.

For those pet owners with busy schedules utilizing professional dog walking services or playtime through dog daycare services is another option. It has been shown that those pet owners that exercise regularly with their pets generally live a healthier lifestyle.

3. Physical therapy: As animals age pet owners offer encounter their favorite canine having more difficulty walking and have a dwindling desire to play with toys. Physical therapy, specifically hydrotherapy is a wonderful way to help older and arthritic animals gain more mobility and lose weight. Hydrotherapy has been proven to have several therapeutic effects on the body including, muscle strengthening, relief of swelling, decreased joint pain, less stiffness in limbs, improved circulation, weight loss, and increased tissue healing to name a few. For more information on the benefits of hydrotherapy:
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4. Veterinary visit and blood work: Weight gain can also be related to underlying health concerns such as hypothyroidism or other endocrine disorders. Scheduling a veterinary evaluation and routine blood work can be another important component in increasing the longevity of your dog’s life. Conditions such as hypothyroidism that predispose dogs to gain weight can be treated with a daily medication to improve hormonal balance. If feel that your dog is unnecessarily overweight there can be an underlying health condition that needs to be addressed.

5. Healthy treats: Pet owners love the chance to reward their favorite canine companion with treats and most dogs jump at the chance to consume these delicious products. The problem is many treats, which can include commercial dog treats or table scrapes can add many unnecessary calories to your dog’s daily intake. Reading labels and making note of the calories in these treats is an important component of understanding your dog’s overall health. Treats should not exceed more than 10 percent of your pet’s daily calories. There are healthier treats that can be offered to your pet to keep calories lower yet provide a fuller sensation. A pet owner can add steamed or pureed vegetables, such as carrots, green beans or sweet potato to add more fiber and thus a fuller feeling for your dog.

Q. Cat was vomiting for a few days. Took to vet, received anti-nausea medicine 2 days ago. Drinks and no longer vomits, but won’t eat. I’m worried
ANSWER : A. If your cat has been feeling nauseated, it is possible that the nausea, or just general illness is making him want to eat less. However, you can try enticing him to eat with a few tricks geared to cats.

Warming up wet foods or even bland people foods such as plain chicken or boiled hamburger can make food more interesting to cats. Cats tend to go for aromatic rather than flavorful foods, so making the food as “smelly” as possible may encourage your cat to take a bite. Bland foods are also good for helping to soothe upset stomachs, which may still be happening if your cat had recently had a vomiting episode.

However, if enticing your cat to eat does not work, or he continues to refuse to eat any food, it is best to contact your local veterinarian for more care and testing. Cats can become very ill if they refuse to eat for more than a few days, and finding the underlying cause can help your cat feel better.

Q. My cat continues to scratch on furniture and carpets. He has plenty of scratching posts around the house. Please help!
ANSWER : A. Scratching is a natural behavior in cats that can be frequently frustrating for pet owners who want to keep their furniture from being shredded on a constant basis. The texture of furniture and carpet is very appealing to cats and this why they frequently choose to spend their time on this activity as opposed to playing with their own cat toys. Here are some suggestions to help curb this unwanted behavior:

1. Purchase a cat scratching post or cat tree that is covered in carpeted or textured material. Place it in an appealing spot that your cat would be inclined to spend time (eg. in the sun). You can also place catnip on the scratching post or cat tree to make your cat even more interested in the new object.

2. You can utilize double sided tape on the ends of the furniture because you cat will not like the sticky feeling and will learn to not scratch in that region. Use the tape that has a lighter adhesive in order to prevent any permanent damage. Other materials, such as aluminum foil or bubble wrap can also be placed on the furniture to discourage the scratching.

3. Keep nails trimmed short by either learning to do this on your own at home or using a veterinary technician, or groomer. Nails can usually be trimmed every 6-8 weeks.

4. Redirect the unwanted behavior. If your cat begins scratching, use a favorite or new toy to distract the cat from the scratching. Give your cat positive praise for not scratching.

5. As a last resort you can use a spray bottle full of water to spritz your cat when he or she is scratching inappropriately at your furniture. Generally, cats do not like water and this will discourage them from continuing the behavior.

Have patience with your cat because it can takes time to understand this is an unwanted behavior and that furniture is not another toy for them to use. You can always consult your veterinary or veterinary behaviorist to help with ideas or further solutions to this problem.

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Q. I have a 17 year old cat and he has been shedding a lot the past 3 years. Is there anything I can do. I brush him but he doesn’t like it.
ANSWER : A. Brushing or providing objects that your cat can use to brush himself on (such as a scratching post with a brush attachment) are often the best ways to remove excess hair. If your cat doesn’t like the particular brush you use, you may want to try a different kind, or even use a warm wet washcloth to wipe your cat down with instead. This will help get rid of some loosened hairs without being as “annoying” to your cat. If he is grooming himself a lot, adding in a hairball paste to his food or placing some on his paw will help keep the hair from forming into a ball or becoming problematic as he removes the excess hair himself.

If you are seeing patches of hair loss, or any other signs of illness in addition to excessive shedding, then scheduling a senior wellness exam with your local vet is always best to check for aging-related issues which may be causing hair loss or other symptoms.

Q. My dog drinks a lot of water, should I worry?
ANSWER : A. Firstly, you should quantify if your dog is actually drinking an excessive amount of water. In a 24 hour period, a dog should drink about 1 fluid ounce (or 30mL) per pound of body weight. Therefore, the recommended amount of water intake (in fluid ounces) equals your dog’s weight (in pounds). For example, if your dog weighs 8 pounds, he/she should drink about a cup of water in a 1 hour period. This will be slightly increased if your dog gets a lot of physical activity or lives outdoors.

You can measure your dog’s water intake the following way: in the morning, measure a specific amount, a little bit more than you think he/she will drink. 24 hours later, measure the remaining amount. If the amount of water your dog drank is significantly greater than it should be, then you should take your dog to a veterinarian.

Causes for mildly increased water consumption include: food changes, increased ambient and body temperature, increased activity, urinary tract infection, and general illness.

Common causes for greatly increased water consumption include: diabetes, urinary tract infection, kidney disease, steroid use, and other systemic diseases. With large increases in water consumption, you will also usually see increased urination. Please take note of urinary patterns to discuss with your vet. Greatly increased drinking and urination is ALWAYS a reason to see a vet.

Q. My cat is one year old. He has diarrhea, not eating last for one day. This problem is too with my other 2 cats and one is died.
ANSWER : A. His not eating is the most concerning for me. They cannot go more than a few days without eating or they risk liver damage. Your cat needs to be seen by your vet for an exam and bloodwork to determine the cause for your cat’s loss of appetite. Based on the findings, your vet will be able to give you a clearer picture of what is going on with your cat and be able to offer you treatment options.

Try enticing your pet to eat with beef or chicken baby food that does not contain onion or garlic powder. Onion and garlic causes anemia. Warm it in the microwave for a few seconds. Stir it with your finger first to make sure there are no hot spots and that it isn’t too hot. This makes it more aromatic and appealing to your pet. Wetting dry food or mixing wet food with low sodium chicken broth, also warmed, might entice your pet to eat. Some cats like to be petted while they eat, some want to be left alone. You’ll know your cat’s habits and be able to act accordingly.