Experienced and professional animal trainer provide their insights in answering this question :
A. You can try tempting to eat with some cooked chicken served warm as this smells stronger and can encourage eating. If this doesn’t work and your cat is lethargic then you need to see your vet and have some blood tests done. It could be just a slight infection which some antibiotics could sort out but it may be something more serious. Your vet will be able to diagnose the problem and treat accordingly.

How to Identify Common Pet Problems ?

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

Medical problems such as kidney disease, pancreatitis, ingestion of non-food material, cancer, dental disease, urinary tract disease, and arthritis can all deter a cat from eating. In addition to health issues, a cat`s psychological well-being can also play a role in altering a cat`s hunger.
But if your kitty is also eating less than usual, or if you are concerned, go ahead and schedule a veterinary appointment. On the other end of the spectrum, if your cat is drinking more water than usual in combination with not eating, this could be a symptom of a health problem such as diabetes or kidney disease.
Lethargic and Not Eating / Drinking—Like lethargy, not eating or drinking well are nonspecific clinical signs that are seen with many cat diseases. Lethargic and Losing Weight—A poor appetite can lead to weight loss, but so can diseases like hyperthyroidism or diabetes, even if your cat is eating well.
Is your cat not eating in addition to hiding and refusing to play or interact? Then they may be ill or hurt. If this hiding behavior continues for a few days, take them to the vet for a checkup. Also, if you have an outdoor cat that stops showing up at mealtime, they could be sick or injured.
You must get to know your cat`s food and water preferences. For instance, some cats like drinking water from a water dish while some like using a cat fountain. You want to try to encourage them to drink. However, you should never force them.
When is a vet needed for a cat not drinking water? If you have a cat not drinking water for 48-72 hours, or shows other worrisome symptoms, such as lethargy, loss of appetite, or changes in urination/defecation, take your cat to the vet as soon as possible.
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.
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.
Reduced appetite. Lethargy. Decreased interest in positive things like playing, social interaction and exploring outside. Being withdrawn and hiding away.
Sick cats often lie quietly in a hunched position. They might neglect grooming. They may be purring, which cats do not only when they`re happy, but also when they`re sick or in pain. A cat with breathing difficulties may refuse to lie on his side and may keep his head raised.
Fussy eaters will often smell the food first, and then if they are not interested, they will generally walk away or turn their nose up in the air. It may be something as simple as they are tired of tuna, but if your cat shows signs of not feeling well, you need to know what to watch out for and what to do.
Never force food on a cat. Syringe feeding or pushing food into a cat`s mouth is stressful and can risk severe medical complications. It can also put a cat off eating altogether (food aversion)
Cats sometimes prefer drinking water that is cold, because they might perceive cold water to be fresher. Keep your cat`s water cold by replenishing it regularly. You could even pop a few ice cubes in the bowl if the weather is particularly warm.
When a cat doesn`t consume enough water, she is at risk for dehydration. “Dehydration occurs when the normal body fluids, including water and electrolytes, fall below required needs,” describes Petcha, causing problems in her energy, skin and organ function.
Natural ways to stimulate appetite in cats

Try luring your cat with a few pieces of their favourite wet food or chunks of fresh tuna. You can also add low-sodium broth or tuna juice to the food as well. Provide variety: Providing variety in their meal plan can stimulate their appetite.

What eye changes may be present in a sick cat? Droopy eyelids, discharges that are green, yellow, or white, squinting, pupils that are dilated or constricted, or anisocoria (one pupil dilated and the other constricted are all signs that something is amiss.
A random bout of fussiness is the most likely reason your cat is licking their food and not eating the whole meal. Our feline companions can develop preferences for particular textures and flavours. Your pet might enjoy the taste of gravy in wet food but dislike the meat chunks.
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.
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.
But what happens when a cat`s sensitive whiskers become overstimulated with too much touch? Whisker fatigue (sometimes called whisker stress) can be the result of a cat`s whiskers brushing against too many things and transmitting an onslaught of messages to the cat`s brain.
It`s very common for the stress of the move to a new home to cause a cat to stop eating for a short period of time. Along with that, you might see that the cat is not going to the bathroom at all.
Cats seem to train us to feed them regularly at their demands for a few reasons. Your cat is all about cleanliness, and they`re all about freshness, too. If that food has been sitting out, your finicky cat might not want to eat it simply because it`s not fresh enough for their high standards.
Unlike dogs, many cats don`t live to eat. While many cats will eat their food (eventually), others are finicky and it`s tricky to get them to eat. The good news is there are ways to get even the fussiest cat to eat.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. Why does my dog eat grass?
ANSWER : A. As another user mentioned, dogs can eat grass when they want to vomit. Sometimes, when a dog has an upset tummy, they will eat grass. If you notice your dog eating grass frantically, you can assume vomiting will shortly follow. Grass does not digest and pass normally. If your dog eats too much grass, it can cause serious issues with pooping. Your dogs poop can end up all tangled inside of her, and it can need veterinary assistance to remove it. The same goes for celery, so avoid feeding celery to your dog.

The other day my boyfriend accidentally left the laundry room door open where we were keeping the trash that was filled with cooked chicken bones. She ate one of the chicken bones lightning fast. We had to induce vomiting by feeding her some hydrogen peroxide. After we had fed her the peroxide, she immediately began frantically eating grass because her tummy was upset.

If there is something lacking in your dogs diet, it could be that your dog is eating grass to make up for it. I am sure that my dogs diet is extremely well balanced (I do not only feed her an air-dried raw food-type diet (Ziwipeak), but a wide variety of safe, healthy foods), so when she eats grass, I know that it is because she has an upset tummy.

That is why I think it is important making sure your dog has a very well balanced diet. If your dog is on a low quality kibble, your dog may be trying to let you know by eating grass (or eating poop).

Q. My dog doesn’t eat, what should I do?
ANSWER : A. If this is a puppy, see a veterinarian immediately. Puppies should want to eat. Common causes for anorexia in puppies include viruses (parvo is a big one), parasitism, and foreign bodies. They need immediate care – go to an emergency vet if yours isn’t open. Puppies can get low blood sugar and dehydration very quickly.

If this is an adult dog and you observe other concerning signs, such as diarrhea or decreased energy, you should see a veterinarian.

If the dog seems otherwise bright and stable, try offering different types of food: wet food, canned tripe, or cooked chicken and rice. Some dogs will go for canned baby food: chicken, turkey, or beef as the main ingredient. Make sure there are no garlic or onions in the ingredients!

Causes of anorexia in adult dogs can range from less serious to severe. Younger dogs are more likely to get into trouble- they tend to eat things they shouldn’t, and can get foreign bodies from eating things like socks, or stomach upset from getting in the trash. Any dog may stop eating due to stress, or just being a picky eater. Middle aged dogs can stop eating when they’re stressed and also have Addison’s disease, which can be fatal. Older dogs tend to stop eating when they develop cancer or renal disease.

There is no one-size-fits-all recipe to know when the right time is to take your dog to the vet. The moral of this story is, if it’s not getting better, your pup feels bad, or you’re worried – go see the vet!

Read Full Q/A … : My Dog Won’t Eat

Q. My dog doesn’t seem to be drinking, what should I do?
ANSWER : A. If it has been this way for a long time and your dog seems otherwise healthy (eating, active), he/she may be getting water from other sources, such as wet food, outside, or the toilet. I would try to identify other sources they could be getting it from first. If the dog is truly not drinking or not getting moisture from wet food or other sources, he/she may need to be examined by a veterinarian.
It is more concerning if a dog suddenly stops drinking, especially if he/she also stops eating. This can be a starting sign of almost any illness and definitely warrants veterinary attention. If the dog is still drinking some, and still eating and active, there may be a less serious reason for the change. For instance, cooler temperatures, food changes, and decreased activity can cause decreased water intake.

Q. My 3 month puppy eats his own poop and is also biting what can I do to prevent this
ANSWER : A. When it comes to poop eating, you want to consider a few things. First off, what is his diet like? Maybe something is lacking in his diet that is causing him to want to eat his own poop. This is the most common reason why dogs eat THEIR OWN poop. Try a higher quality kibble like Taste of the Wild, Ziwipeak, Orijen.. and try feeding three meals per day, instead of the more common two meals per day. Remember to gradually switch his kibble. Add a little bit of the new kibble and reduce the old kibble very slowly.. little by little every couple of days until the bowl is mostly new kibble! You should also be cleaning up his poops IMMEDIATELY after he does them.. I mean like, you have a bag in your hand, and you are low enough to scoop it up RIGHT when he finished so he doesn’t have a chance to eat his poop.

When it comes to nipping there are a few things you can do. First, you should yelp as soon as the teeth touch your skin, stand up, cross your arms, and ignore the puppy until he is ignoring you. Once he is off doing his own thing, swoop down and calmly reward him by playing with him WITH A TOY so he doesn’t nip your hands. Whenever you pet him, or interact with him, you should always have a toy on-hand so you can give it to him. This toy should be a soft braided rope toy that YOU own. This means, your puppy is never allowed to have this toy on the floor, and your pup can never “win” tug games with this toy. This is YOUR toy that disappears when you’re finished playing, and reappears when you want to play. If you keep this up, in a weeks time, your puppy will be so excited to see that toy, that as soon as you bring it out, he stops nipping you because he wants to play with the toy. Another thing you can do is have two bags of toys. Bag#1 is full of chew toys/soft toys/squeaky toys/etc. After one week, Bag#1 disappears and out comes Bag#2. Bag#2 has the same types of toys as Bag#1, and it only stays out for one week. This keeps the toys feeling like new to your pup!

Q. My dog hasnt eaten snce I left 4 days ago. I won’t be home for 6 more days. How can the caretaker get her to eat?
ANSWER : A. If your dog is feeling a bit sad while you are away and is refusing to eat, your pet sitter may try some things such as adding in boiled chicken or turkey to meals to encourage eating. A pet-safe gravy may also entice your dog to eat as well while you are gone. Your pet sitter may also want to offer smaller meals more often throughout the day to give your dog more chances to try and eat when she is feeling more comfortable and a little less sad. A game of fetch or playing together may also get your dog’s appetite going and help her to feel more comfortable eating around your pet sitter.

If your dog is showing any other signs of illness in addition to the refusal to eat (beyond normal missing an owner), then it is always a good idea to keep an eye out and contact a veterinarian as needed.

Read Full Q/A … : ufdc.ufl.edu

Q. My 9 month old Maltese-Shih eats his own feces. Is there anything i can give him to get him to stop?
ANSWER : A. Coprophagia (or eating stool) is very common in young dogs. Luckily, most dogs will outgrow this behavior as they age. There are several theories as to why dogs do this which range from mimicking the mother dog’s behavior of cleaning the den, nutrient deficiency, boredom or just plain enjoyment of it.

If your dog is eating his own, removing the feces as soon as he deposits them is best in preventing them from being eaten. Keeping your dog on a leash while he potties can also help to catch any stool before he finds it. If he is eating other stool as well, sweeping the area prior to letting him out to go potty can help you identify and remove any left-behind stool.

There is also a product called For-bid that is available to make stool distasteful to pets. This product is sprinkled over every meal for a period of a week. When your dog attempts to eat the stool formed from this product, it becomes distasteful and discourages him from doing so. Most dogs will stop after a week of use, but some may need a few reminders from time to time to completely stop the behavior.

Q. My dog recently stopped eating after he was overfed by mistake, he seems fine, he is still drinking but refuses to eat. Its been nearly 48 hours now.
ANSWER : A. Overeating may have caused some digestive upset, which is causing him to not eat, however overeating may also cause a serious condition called bloat. Bloat symptoms include a large bloated abdomen that may be painful to the touch, labored breathing or panting, attempting to vomit or defecate without success, refusal to eat, and pale or blue tongue and gums. If you see these signs, then immediate veterinary care is needed. If your dog seems otherwise fine except for not eating, you can try to entice him to eat and settle minor upset stomachs with a meal of boiled rice and chicken, however if he has not eaten in over 48 hours it is best to seek veterinary care as a more serious problem could be underlying.

Read Full Q/A … : When to put a dog to sleep

Q. My cat has started acting strange since my brother brought his two cats around. She won’t eat or drink and pukes up white foam. Could it be stress?
ANSWER : A. If she’s not eating, she could be going into liver failure (hepatic lipidosis). This can happen when cats get stressed (like after household changes) and stop eating, if only for a day or two. It could be a lot of other things, but I would want to take her to a vet for a work up. Hepatic lipidosis is usually very serious. I worry about it any time a cat stops eating.