Experienced and professional animal trainer provide their insights in answering this question :
A. He may have a painful abdomen. I would recommend calling your emergency vet to discuss the case in more detail to see if he needs to be seen as an emergency or not.

How to Identify Common Pet Problems ?

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

Your dog may pant if they have a high fever in an attempt to cool themselves down. Your dog may be on a medication that increases their panting. If your dog is bloated, it may cause them to pant. If your pet starts to dry heave or vomit, it can be an emergency, and they need to see a veterinarian immediately.
Heavy panting is one sign your dog may have suffered an injury. Other signs of pain or trauma in pets include enlarged pupils, reduced appetite, a reluctance to lie down, restlessness, anxiety, and licking or biting at the pain site. Dogs may mask their pain with normal behaviors, such as wagging their tail.
If pain or discomfort is not the cause of heavy panting, your dog is likely exhibiting panting and restless behavior is likely due to underlying stress, fear, or anxiety. Anxiety is the most common cause of panting and restlessness in dogs without other clinical signs.
Gastrointestinal Distress

Conditions such as pancreatitis can be excruciating, again leading your dog to display panting and pacing behaviors. If your dog is showing signs of GI illness such as vomiting, diarrhea, or not eating, in addition to the panting and pacing, see a veterinarian as soon as possible.

Dogs with a high fever may pant to help lower their body temperature. Medications given by the veterinarian may increase respiration or prompt panting. A very full stomach or bloat may also cause your dog to pant, sometimes in preparation for vomiting.
Rapid breathing in dogs may simply be down to excitement or exercise. Dogs may also pant when they`re in fear, stressed or hot. Panting is one of the most important ways a dog thermoregulates. But beware, heavy or rapid breathing is an early sign of heat stroke and should be closely monitored.
Dogs that aren`t feeling well may appear restless. Because they are in discomfort or even in distress, they may pace about your home or not sleep well at night. Dogs, for example, that are suffering with a life-threatening condition called bloat may appear agitated, uncomfortable and restless.
On average a healthy dog will take between 15 to 35 breaths per minute when they are resting. (By nature your dog will breathe more heavily and pant when exercising). Therefore, anything more than 40 breaths a minute when your dog is at rest is considered to be abnormal and should be investigated.
Respiratory problems can manifest in lots of different ways, including coughing, noisy breathing, a change in voice or reduced ability to exercise. More severe signs of breathing difficulties may include: Rapid breathing or continuous panting. Long drawn out breathing.
There are also cases that occur from non-dietary reasons that remain a mystery to owner and veterinarian alike. One of the most common foods involved in the cause of pancreatitis is pork or pork products.
The most common reasons your dog may not be comfortable while lying down are joint pain, anxiety, dementia, pancreatitis, bloat and heart disease.
If your dog is panting while resting, it could be a sign of an underlying health problem, such as respiratory issues, heart problems, or obesity. However, it could also be a normal response to a warm environment. Dogs pant to keep themselves cool when they`re too warm.
Offer your dog some water.

A panting dog can become dehydrated quickly, so it`s important to offer them water as soon as possible. If they`re not interested in drinking, you can try offering them some ice cubes or frozen dog treats.

Hyperventilation in dogs is characterized by short, rapid breaths, and it may appear as though your dog is struggling to breathe. It`s the exact same phenomenon that occurs in humans. Hyperventilation in dogs is not the same thing as heavy panting or heavy breathing, though.
It is normal for your dog to pant, especially if they are hot, overstimulated, injured or sick. Light panting is generally nothing to worry about. Labored panting for longer than 30 minutes when resting and not in a hot environment is a concern and should be checked by your veterinarian.
Signs of ARDS include increased respiratory rate, blue discoloration of the skin and mucous membranes (gums, insides of the eyelids) due to poor oxygen delivery, and, occasionally, coughing. Some affected dogs may have pink, foamy fluid from the mouth or nose, which is coming from the dog`s lungs.
Gastritis is defined as inflammation of the lining of the stomach. It may occur as a short episode (acute) or have a long duration (chronic) and may be associated with underlying conditions that are more serious.
If your dog has been vomiting frequently or it has become a long-term or chronic issue, this is cause for concern, especially if you`ve noticed symptoms including abdominal pain, depression, dehydration, blood, poor appetite, fever, weakness, weight loss or other unusual behaviors.
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.
It will look like a severe tummy upset with vomiting and severe abdominal pain. They often drink lots of water too and are off their food. They are all pretty non specific signs really and blood tests are needed to make the diagnosis. Can anything be done to prevent pancreatitis.
Boiled chicken, low fat beef, egg whites, yogurt, barley and cooked vegetables are also considered safe foods for pancreatitis patients.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. Great Dane, Lab mix is vomiting, lethargic, bloodshot droopy eyes. No appetite. What’s wrong?
ANSWER : A. Vomiting is a common symptom of many illnesses which can range anywhere from minor digestive upset, to mores serious problems such as disease, illness or even bloat.

If your Dane Mix has only vomited once or twice, it may just indicate a minor stomach upset. Picking up food for a few hours then feeding a bland meal of boiled chicken and plain rice can help soothe the stomach and entice eating. However, if the vomiting continues or symptoms persist for more than a day, it may indicate something more serious going on and should be looked at by your vet.

Large and giant breed dogs are more prone to a condition called Bloat, which is considered a medical emergency. Signs of bloat in a dog include a large distended abdomen, pain in the abdomen, signs of distress such as heavy panting, pale gums or tongue, vomiting and diarrhea, or attempting to vomit or defecate without success. If you suspect your dog may be experiencing bloat, contacting your vet or emergency clinic immediately is best.

Q. My dog has Addison’s Disease and is panting alot, is this normal?
ANSWER : A. I don’t typically associate panting with Addison’s disease. I do see panting (it’s a primary symptom) of the disease that’s the opposite of Addison’s disease, which is Cushing’s disease. Cushing’s disease involves having an overactive adrenal gland, as opposed to a non-active or under active adrenal gland. Panting can also happen with steroid administration. If you’ve upped the dose of prednisone that your dog normally takes to combat holiday stress that may be the cause of the panting.

Panting can be a sign of stress, so evaluate the environment and see if there’s something that could have your dog agitated – fireworks, small children visiting, etc. This is especially important with an addisonian dog, as I’m sure you know.

Other causes of panting could include primary respiratory problems or heart disease, since low oxygen states can trigger panting. Definitely mention this to your vet (a phone call isn’t a bad idea) for this reason, just to see if he’ like to examine your dog to make sure everything’s OK>

Q. My French Bulldog (11 months) threw up after eating and is dry heaving, plus he’s not acting normal. His breathing is nasally and he’s lethargic. Help
ANSWER : A. Vomiting is a common symptom that can be a sign of numerous health issues ranging from minor digestive upset, to bloat or internal illness. If the vomiting has only occurred once and everything else is normal, a bland diet of plain boiled chicken and white rice can help.

Since your Frenchie is having other issues such as trouble breathing and lethargy, it may be a good idea to contact your vet for advice. Minor digestive upset can cause lethargy due to the energy expended in vomiting, however prolonged symptoms usually indicate something more serious is going on.

Bulldogs are one breed that are prone to bloat (though any breed of dog can be affected), a serious medical emergency. Signs of bloat can include a suddenly painful and bloated abdomen, signs of distress such as heavy panting, whining, or trouble breathing, pale gums and tongue, vomiting and diarrhea, or attempting to vomit or defecate without success. If you suspect your dog may be experiencing bloat please contact your vet or emergency clinic immediately.

Q. My dog has been throwing up a clear liquid (a little slimey) but otherwise acts fine. Could something be wrong?
ANSWER : A. How long has he been doing this? Ongoing vomiting (>2 weeks) warrants a vet visit, but if it’s a one-off, or happens very infrequently then it could be due to something he ate disagreeing with him. Is he is bright, alert and happy in himself I would monitor him, start keeping a vomit journal (seriously) of when he vomits, how much, what the vomit was like, what he was doing before and any other notes. This will be really useful for your vet if it requires further investigatoon. You can also try bland food – boiled chicken and white rice – in small amounts on his vomit days to give his tummy a rest. Withhold for 8h after a vomit and reintroduce the bland diet in small, frequent meals.

Q. My dog was sick last night vomiting and today has been down all day won’t eat or drink water. What could be the possible causes?
ANSWER : A. Vomiting is a sign of several diseases like gastritis, gastrointestinal infection, gastrointestinal foreign body. Vomiting may be due to kidney or liver disease, pancreatitis and many more. You should take your dog to your vet as one of the common problems in vomiting dogs is dehydration and dogs do go downhill quickly if they loose plenty of fluids through vomiting.

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Q. He is not eating or drinking seems like he has no energy and vomiting and seems like he weak
ANSWER : A. Causes of not eating and vomiting can be many. Gastrointestinal infection, caused by bacteria (salmonella, for example) or viruses or parasites (although parasite infections tend to be more mild, but giardia can make them feel pretty bad) can be a cause. Eating something he shouldn’t have, like the trash or rotten food can cause it. Intestinal obstruction can cause vomiting as well. Other causes (non-GI) of vomiting include kidney failure (can be due to many things, such as toxins, kidney stones, cancer) or liver diseases or liver failure.

The vomiting is concerning, however the weakness and lack of energy implies that he’s either seriously dehydrated or there’s a lot more going on than just s simple case of vomiting. He needs to see a vet and have testing, likely to include x-rays and/or blood work, to see what’s going on, so that it can be treated.

Q. I have a kitten 10month male ragdoll today he vomited twice the first vomited is all water at evening and at midnight yellow liquid with his own hair
ANSWER : A. If he brought up hair in the vomitus he may have just been trying to expel the hairball. Sometimes they’ll vomit without bringing up the hairball, then they’ll get it up the second time. As long as he’s not vomiting anymore, is playful and eating normally, he’s probably find. You can purchase over-the-counter hairball paste which may aid him with expelling the hairballs in the future.

If the vomiting continues you should definitely take him to your vet for an exam in order to figure out what’s causing it.

Q. My puppy is throwing up her food this morning and yellow foamy stuff. Please help!
ANSWER : A. If the vomiting has only occurred once, it may be due to the fact that there was something causing a minor upset stomach in your pup. Yellow foam is often acid, and tummies that are upset or that have been empty for too long can cause this to appear in vomit. It may just be that your puppy needs an extra meal in the day to help keep her stomach happy. Eating a meal too quickly can also cause a pup to vomit up undigested food and foam, and feeding smaller meals more often, or slowing down your dog’s eating can help.

If the vomiting has only happened once, pick up your puppy’s food for an hour or two and then offer a bland meal of plain boiled chicken and plain rice. These bland ingredients can help settle upset stomachs while being enticing “people food”. If the vomiting does not occur again, you can return to a normal feeding schedule.

However, if the vomiting continues, worsens, or new symptoms appear along with it, then it is a good idea to schedule an appointment with your vet to rule out any more serious causes.