Experienced and professional animal trainer provide their insights in answering this question :
A. Go to your emergency vet immediately

How to Identify Common Pet Problems ?

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

Infections, illnesses, and pain can make your dog tired, listless and uninterested in food. When these symptoms continue for more than 24 hours, they could indicate the presence of a health issue that requires a visit to our veterinary hospital in Diamond Bar.
The most common causes of lethargy in dogs are: Infection, including parvovirus, distemper, kennel cough and leptospirosis. Metabolic diseases, such as heart problems, liver problems, diabetes, and hypoglycaemia. Medications, such as newly prescribed drugs or a new flea or worm product.
Some of the signs of parvovirus include lethargy; loss of appetite; abdominal pain and bloating; fever or low body temperature (hypothermia); vomiting; and severe, often bloody, diarrhea. Persistent vomiting and diarrhea can cause rapid dehydration, and damage to the intestines and immune system can cause septic shock.
Anything that can cause a dog to feel ill, such as kidney disease, pancreatitis, intestinal parasites, liver disease, cancer, infection, intestinal obstruction, etc., can lead a dog to refuse food and water. Like humans, dogs cannot go for more than a few days without water, so this should be treated seriously.
The clinical signs of more advanced kidney failure include loss of appetite, lethargy, vomiting, diarrhea, and very bad breath. Occasionally, ulcers will be found in the mouth.
Pay attention to any changes in your dog`s behavior

Seemingly benign symptoms like butt scooting, head shaking, pawing at ears or eyes, drooling and increased water intake, among others, can indicate that there`s a medical issue.

Sometimes, changes in your lifestyle, such as your new working schedule, moving to a new home, the arrival of a new baby or a new pet, may disturb their sense of safety. Be patient and help your dog adapt to change by keeping a consistent routine.
Parvo smell has a unique very bad-smelling poop that is not easy to forget. The smell has been described as metallic, with hints of blood stench since the virus affects the intestinal walls, and a seemingly sweet scent.
Dehydration is very serious; dogs with canine parvovirus refuse water and quickly dehydrate due to their constant vomiting and diarrhea symptoms.
Sick dogs need a lot of sleep and rest. Provide a quiet and comfortable place for your dog to relax that is free of disturbances, including other pets or young children who may be a bother. You may want to keep your sick dog in a private room or separate area of the house to ensure that they are left alone.
Signs of heartworm disease may include a mild persistent cough, reluctance to exercise, fatigue after moderate activity, decreased appetite, and weight loss. As heartworm disease progresses, pets may develop heart failure and the appearance of a swollen belly due to excess fluid in the abdomen.
Or perhaps your dog is having trouble walking all of a sudden. This can happen as a dog gets older, or it could result from an injury or illness. Instead of brushing it off when your dog has trouble standing or walking to see if it gets better with time, call your vet and schedule an appointment immediately.
What are the clinical signs of pancreatitis? The most common clinical signs include nausea, vomiting, fever, lethargy, abdominal pain, diarrhea, and decreased appetite. During an attack, dogs may take a `praying position`, with their rear end up in the air and their front legs and head lowered onto the floor.
There is a higher prevalence of pancreatitis in Miniature Schnauzers, Yorkshire Terriers, Cocker Spaniels, Dachshunds, Poodles, sled dogs, or other breeds. Some infections, such as Babesia canis or Leishmania, may also contribute to the development of pancreatitis.
Some of the earliest signs of kidney disease in dogs may include subtle weight loss, urinating/peeing more often and drinking a lot more water. Therefore, if you notice your dog is peeing on the floor or asking to go out more, or if your dog is always thirsty, it`s time to visit your veterinarian.
Some of the signs indicating that your dog is sad include sleeping more than usual, not wanting to play or exercise, hiding from you, laying around a lot, not eating as much, staying close to your side but not wanting to be petted, pacing, aggression, and whining.
The symptoms of depression in dogs are similar to those experienced by people. Common symptoms include low activity levels, a loss in interest in the things they once enjoyed, and a change in eating and/or sleeping habits. Some dogs may also show signs of aggression, including uncharacteristic howling or whining.
Lethargy is a common sign of illness. When your dog doesn`t feel well, he may have a decreased energy level. Any behavior that is unusual for your dog, such as hiding, listlessness or pacing, difficulty breathing, or trouble walking, merits a call to your veterinarian.
Clinical signs of poisoning in a dog may include: Gastrointestinal signs: vomiting, diarrhea, extreme salivation, loss of appetite, and nausea or dry heaving. Internal bleeding: indicated by pale gums, a racing heart, coughing up or vomiting blood, weakness or lethargy, or a dog`s falling over or collapsing.
Fatigue. “Most dogs that are depressed will lay around more and not really want to interact with other people in the house,” says Ochoa. It could be their age, but if it`s suddenly come on, or they`re sleeping way too often, then it might be depression.” Have you recently changed your routine?
Wincing, Whining or Crying

All three of these actions indicate an injury or some kind of pain your dog is experiencing. If you start to pet your dog and they shy away from your hand or whine, you know there is something wrong.

Although vaccination is effective at preventing Parvo, even vaccinated dogs may occasionally be infected by Parvovirus and develop disease. The vaccine provides immunity against the virus, but it is not 100% effective.
The near-death signs of parvo include severe lethargy, continuous bloody diarrhea, anorexia, and bloody vomiting. You may not want to admit it to yourself, but this is the point of no return. So consider doing a humane thing by putting your puppy to sleep.
The scent generally associated with parvo is caused by blood in the stool. Dogs with bloody stools because of hookworms have precisely the same smell. MORE IMPORTANTLY, if a puppy is diagnosed with Parvo BEFORE there is blood in the stool, the antivirals` effectiveness is MUCH GREATER.

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. Why does my dog eat grass? He throws up afterwards!
ANSWER : A. There is much debate over why dogs eat grass and then vomit afterwards. One theory is that the dog may have an upset stomach, and so eats the grass blades which then irritate the digestive system and causing vomiting to happen. Another theory is that the dogs are eating grass to mimic a “lost nutrient” of their ancestors found usually by hunting and then eating the contents of the stomachs of herbivores. A third theory is that dogs just do it because to them, it’s fun and they can.

If your dog has been vomiting a lot recently, either related to or unrelated to eating grass, then it is always a good idea to schedule a wellness exam with your vet to make sure there are not any issues causing illness. Grass, especially in areas where livestock may graze can also be a host for parasite eggs, which can in turn infect your dog with an internal parasite (and thus cause vomiting and diarrhea).

If your dog is not eating at all, this is more concerning and points further to some digestive upset causing his or her symptoms. Making an appointment with your vet as well as bringing in a sample of his or her stool is best for helping your pet feel better.

Q. My 2 months old rottweiler puppy isn’t eating properly. Shes only eating shredded or minced chicken but adding any thing means she won’t eat.
ANSWER : A. This is not a nutritionally adequate diet for your puppy. She needs to be eating a good quality puppy food. Put the proper amount in her bowl and put it down without any fuss. Leave it for fifteen minutes. After that, if she has not eaten, pick it up–again without fuss–and do not give her anything else to eat until her next scheduled mealtime, not even treats. When she is due to eat again, repeat the process. This may take quite a few days to resolve, as she will try to hold out for the chicken. Do not give in! Remember that you are not starving her. The food is there, but she is choosing not to eat. When she realizes that this is all she is going to get, she will begin to eat and your problem will be solved.

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.

Q. Cat’s been vomiting a lot and has become very common. The vomit used to be tubular, but is now liquid. Now she’s not eating, weak, and sleeping more
ANSWER : A. Your cat’s symptoms are very concerning. Cats 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.

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 20 month Cavalier doesn’t eat unless I let him eat from my finger, then he eats. Sometimes he will only eat once a day and leave his food.
ANSWER : A. It is possible that your dog is just not satisfied with his current food, or may be a picky eater. There are several things you can try to encourage your dog to eat.

The first step is to remove any additional treats or people food that may be more enticing to your dog than his own meal. If you feel you must give him some form of treat, be sure to place them directly in his food bowl and mixed with his regular diet. This allows him to get some snacks while also “forcing” him to try out his current meal to get the reward.

Enticing your dog to try his food by adding a pet-safe gravy or even a few treats of plain boiled chicken mixed in can help. Be sure to mix the foods thoroughly so he must explore his own food before getting the treat.

Some small breed dogs may also have a hard time with certain bowls and their collars. If there is a metal name tag on the collar and a metal bowl, the clinking sound can sometimes scare off dogs and make them not want to eat from their bowl. Using a bowl of a different material, or removing the collar prior to a meal may help with this issue.

Your dog may also just not be into his current food and may like another variety better. You can try a new variety by gradually switching over a period of 7-9 days, slowly adding in more new food and removing old until it is switched. This change may encourage him to try out meals again, and the slow changeover will allow his body to adjust to the new diet without digestive upset.