Experienced and professional animal trainer provide their insights in answering this question :
A. Any cat that stops eating and is lethargic should be seen by a vet because cats can develop severe liver changes(hepatic lipidosis)from anorexia.Also breathing difficulties is a very concerning sign.

How to Identify Common Pet Problems ?

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

For cats, fevers are a common cause of lethargy and might be the result of an infection. Cats that are lethargic or sedated is frequently a sick cat. Older cats might be experiencing age-related body changes, and arthritis and/or joint disease will certainly slow down most cats.
Call your veterinarian immediately if your cat is extremely lethargic or if their lethargy occurs in combination with other serious symptoms like difficulty breathing or severe vomiting or diarrhea.
Signs of lethargy in kittens may indicate serious illness. Lethargy is more common in adult and senior cats because they`re more likely to become ill. However, there are many causes of lethargy, including poor diet, stress, and pain.
Being overweight can be a cause of lethargy. Viral, Bacterial or Parasitic Infections – Viral and bacterial infections can make your cat feel sick. Fevers brought on by infections will also make your cat lethargic.
Reduced appetite. Lethargy. Decreased interest in positive things like playing, social interaction and exploring outside. Being withdrawn and hiding away.
Emergency Protocol: In many instances, a fading kitten will not survive, even with medical intervention, however, taking these steps immediately will give the best prognosis! 1. PROVIDE WARMTH – Wrap the kitten in a blanket or towel, leaving only their face exposed.
Cats with colds may have symptoms including coughing, sneezing, discharge from the eyes or nose, lethargy, and sometimes fever. For many cats, these symptoms are will go away on their own in about 7-10 days. However, some cats may experience complications, such as a secondary bacterial infection or pneumonia.
Symptoms of Fading Kitten Syndrome

Early signs that a kitten is fading may include lethargy, lack of interest in nursing, sleeping separately from the litter, and whining. Caregivers may notice that the kitten`s skin is less elastic, which is a symptom of dehydration.

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.
When there are too many bad days in a row, or if the cat seems to be turned off to life, quality of life is compromised. Bad days may mean nausea, vomiting, diarrhea, seizures, frustration, unrelenting pain/discomfort, or inability to breathe.
Cats do seem to be aware of death, but it is hard to know how much they understand the concept and whether they fully understand the finality of their own passing. They certainly understand when they are feeling ill or that something is different or wrong.
If you notice your cat losing consciousness, take him to a veterinarian right away, even if he recovers after a few minutes. The underlying health condition could be life-threatening, so it`s important to seek immediate medical attention to protect your cat.
Kittens who seem too weak to nurse can often be stimulated by rubbing some Karo syrup on the lips. If a kitten still refuses to nurse — and this happens beyond the first few “getting the hang of it” times — it indicates illness. The kitten should be put on Amoxicyllin.
Symptoms Your Cat Is Stressed

Scratching up the wall or carpet can be a sign of stress. Spraying and urinating outside the litter box are traditional stress symptoms for cats, even after they`ve been neutered or spayed. A howling cat that meows excessively may be a sign of stress, as can eating less or sleeping more.

Sleep is also important for our feline friends – they are a species renowned for their hours of idle slumber! But cats can suffer from sleep deprivation too and it is important they are given enough opportunity to recharge their batteries to help them live happy and healthy lives.
A cat`s loss of appetite often indicates illness and is a medically significant symptom. Therefore, it is important to monitor your cat and if the behavior lasts for more than a day you should call your vet immediately.
Single kitten syndrome is the idea that young kittens, when raised with other young kittens and cats and then adopted into a home by themselves, can become aggressive, anxious, stressed, and even develop behavioral issues like inappropriate chewing/scratching and inappropriately using the litterbox.
Typical Symptoms of a Cat Cold

The first symptoms that will be noticeable in your cat are red watery eyes, sneezing, and snorting to clear the congestion.

Signs of dehydration include lethargy, weakness, poor appetite, dry mucous membranes, and, in more severe cases, eyes that are sunken into their sockets. The most common causes of dehydration in cats are diseases that cause increased water loss.
Excessive sleep: Cats normally sleep a lot, but sad or depressed cats sleep even more. If there have been changes in the location of a favorite nap spot this can also indicate sadness, especially if the new spot is hidden or out-of-the-way.
No, cats cannot get colds from humans. The vast majority of viruses are highly species-specific and will not survive in a different host. Some bacterial infections can be transmitted to and from humans and cats, but this is rare.
If your cat sleeps on your bed, he may choose a position that lets him see out your bedroom door more easily. If he`s curled up in a ball under your bed or in a quiet corner, then he may be hiding. Cats who sleep under the covers might love being close to you, or they might be hiding to feel safer.
If there is no interest in play or exercise, your cat may be feeling unwell, stressed, or be in pain. Being proactive can help get to the root of a health concern earlier rather than later. Cats have preferences, just like us. Whatever activity or toy you have introduced to your fur friend simply may not interest him.

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. 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. Returned home from 6 day trip (neighbor w/cats took care of ours),Kitty won’t eat, seems lethargic & breathing is very shallow. Urinating ok
ANSWER : A. Any cat that stops eating and is lethargic should be seen by a vet because cats can develop severe liver changes(hepatic lipidosis)from anorexia.Also breathing difficulties is a very concerning sign.

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. My cat seems to have lost control of her bowels and no longer uses her litter box even to urinate. She is 5 or 6 yrs and is in good health otherwise
ANSWER : A. If your cat has had a sudden change in litter box habits, it is always a good idea to rule out any underlying issues with a wellness check from your vet. Bringing in a urine and stool sample if possible can also help as tests can be run on these samples to check for common infections or parasites. If these are present, treating them usually helps resolve the problem of not using the box.

Loss of bowel control usually results in dribbling of feces or urine rather than complete accidents. If you are seeing this, it is possible that an injury to the hind end or problem with the nerves or muscles is happening and should be looked at by your vet.

If the accidents are complete (full amount of stool, big puddle of urine) your cat may be choosing not to use the litter box due to illness, a too-dirty litter, litter pans that are too tall (which may make older cats have a harder time getting in and out), or a litter substrate that was changed too suddenly. Sometimes, changing the environment your cat’s litter box is in by lowering the sides, moving food and water dishes away and returning back to a previously liked litter can help.

In any area of an accident, an enzymatic cleaner should be used. These break down urine and stool particles, making it so that your cat is less likely to be attracted to going there again. Moving stools to the litter box can also entice your cat to start going there again.

Q. Male neutered cat [1 1/2 years old] has just started trying to spray everywhere around the house. Nothing is coming out. No recent changes.
ANSWER : A. Changes in urinary habits can be caused by a number of things, especially in neutered male cats. Attempting to urinate or have accidents in places other than the litter box can often be a sign of a urinary tract infection, or crystals and debris in the bladder causing problems. Pets may need to go more frequently, may dribble or urinate in small amounts more often, may have accidents or may have blood-tinged or cloudy urine.Infections are usually treated with medications and changes to the diet, however in some cases of large stones or crystals surgery may be needed.

Male cats can also experience urinary blockage. This is due to a unique anatomical part or the urethra that forms a U-shape before exiting the body in male cats. If a cat has crystals or other debris in the urine, it can block at this point preventing urine from being able to exit. Cats may attempt to urinate without producing anything, may become very vocal (indicating pain) or may have a hunched back, full abdomen or pain in the abdomen (protecting the very full bladder). Urinary blockage IS a medical emergency so if suspected, your vet or local emergency clinic should be contacted immediately. Treatment usually involves a hospital stay and catheterization of the bladder to remove the blockage and allow urine to drain followed by medications and a change in diet to prevent further problems.

It is best to try and collect a sample of urine and make an appointment for your cat if he has had a change in urinary habits. If you do suspect a blockage, then contact your vet ASAP is best.

Q. I have a cat that defecates in the litter box but always urinates outside the box. It is very annoying.
ANSWER : A. Inappropriate elimination in cats is often a behavioral problem rather than a medical problem, so the first step is to have him seen by your vet to eliminate any kind of illness or condition as a cause for his eliminating outside the box.

If medical issues are ruled out, take a look at other reasons. Has there been a lot of unusual activity? Has you cat been left at home or boarded? Is the litterbox in a busy area? Has anything happened recently in this area to make him reluctant to use it again? Is there another cat, pet or person that is preventing him from getting to the box? Have you changed it from a hooded to an open box, or vice versa? Is it big enough? Have you changed the type or brand of litter? Is there something attractive about the spot he uses? Cats dislike disturbances to their routine and may act out to express their dissatisfaction.

The general rule is one litter box per cat in the household, plus one. That way each cat can have a place of their own to go in case the box is occupied or another cat has claimed it as territory. They should be scooped daily, if not more often and changed completely weekly, washed with soap and water only. You can offer one kind of litter in one box and another kind in another to see if there is a preference. I don’t recommend the crystals, it makes a hissing sound when wet that startles some cats and make them reluctant to use it again. The litter boxes should be located in a quiet, low-traffic area so that the cat can use them in peace. Make sure any other pets or people aren’t giving them a hard time around or in the litter box. It may take some investigation and experimentation to find your cat’s preference and accommodate him so that everyone is satisfied with the situation. And, when cleaning up pet accidents, don’t use any cleaner containing ammonia. This leaves behind a scent similar to urine.

Q. My cat is pooping outside of the litter bix. He is 2 1/2. He did this as a kitten. It stopped then started about 3 months ago. Litterbox is clean.
ANSWER : A. Inappropriate elimination or house soiling can be a frustrating problem but with a bit of detective work on your part, there is hope. First, before deciding that this is a behavioral issue, any medical problems (diarrhea, constipation, fecal incontinence, pain on defecation, etc.) need to be ruled out and/or treated. If your cat receives a clean bill of health from your vet but is still eliminating outside the litterbox, then we need to consider that something about the box itself might be aversive to your cat. Cats can be quite finicky about their litterbox and toileting habits. Below I have listed common recommendations and cat preferences for litterbox use. Review the list and make any changes that could account for your cat’s aversion to defecating in the litterbox:
* Soft, fine-grained clumping litter (vs, coarse-grained, non-clumping litter)
* Unscented
* 1 – 1 1/2 inch depth (especially older cats or cats with hip problems)
* Larger pans (especially for large cats) – want to get whole body inside – poop just outside the box might mean the box is too small
* Open, non-hooded
* At least one shallow side to get in and out easily
* Easy to get to – not hidden away, preferably in areas they spend time in or near – and not near appliances that make scary, unpredictable noises (washers, dryers, refrigerators)
* Scoop minimum 1X/day – preferably 2
* Clean the litterbox with soap and water and put in fresh scoopable litter at least once/month (instead of just continuously adding)
* Some cats prefer to urinate in one box and defecate in a separate box, so you may need 2 boxes even if you just have 1 cat. Multi-cat households should have 1 box/cat plus 1 extra.