Experienced and professional animal trainer provide their insights in answering this question :
A. It sounds like your dog may have a serious neurologic issue, illness or may have gotten into a toxic substance that is causing her to be nauseated or have changes in cognition and behavior. It is best to seek veterinary care ASAP if her symptoms continue.

How to Identify Common Pet Problems ?

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Shaking may be a sign that your dog is nauseous. Other signs include listlessness, lip smacking, swallowing or salivating more than usual, hiding, yawning, and vomiting. Treatment for nausea depends on what`s causing it. Poisoning is one cause of nausea.
If your dog is lethargic and drooling, it could mean they are nauseous or have ingested a toxin. It is important to check their environment to see if there is anything they could have gotten into. Drooling can progress to vomiting, which can have many causes.
If your dog is vomiting a clear liquid, it can either be caused by stomach secretions or when there is water pooling in the stomach that comes up by itself when vomited. Often, this happens when a dog drinks while feeling nauseous and can`t even keep the water down.
Potential causes include inner/middle ear infections, intoxication, strokes, tumors, infectious or inflammatory diseases (meningitis), idiopathic vestibular disease (also called “old dog” vestibular syndrome), or other less likely causes.
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.
Hypoadrenocorticism is an uncommon disease in dogs, and it is caused by a deficiency of essential hormones that are made by the adrenal glands. Also known as Addison`s disease, the clinical signs may appear as vague signs of illness that come and go.
Sensory ataxia is when the spinal cord becomes compressed due to a bulging intervertebral disk or a tumor. As well as staggering, stumbling and falling over, signs of ataxia include flicking of the eyes from side to side, head tilt, walking in circles, vomiting, and nausea.
Infection, inflammation, or brain tumors (tumors of the brain or brainstem) are the most common reasons for a dog to develop central vestibular syndrome signs. Infections may be caused by bacteria, fungi, viruses, or protozoa. Many of these same causes can also affect the cerebellum, causing cerebellar ataxia.
The inner ear is where the sense of balance originates, and when it is damaged, that balance can be lost. Infections, inflammation, tumors, and trauma to this sensitive area can cause your dog to be shaky and uncoordinated.
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.
Acute pancreatitis can occur after a dog eats a fatty food such as pork, beef, and some other human foods. Dogs that get into garbage can develop pancreatitis. Pancreatitis can also have other causes, including certain medications and some viral or bacterial infections.
‍Stage IV: Signs are at their worst because there are severe elevations of kidney values in bloodwork. Kidney failure can also cause painful ulcers in a dog`s mouth and make them feel sick, nauseous and weak, leading to poor quality of life in the later stages.
Stage 4 Kidney Disease

In stage four kidney failure in dogs, creatinine levels are high. The pup is at risk for emerging systemic signs affecting the entire system. The kidneys will not be able to filter out waste. Protein in the urine increases further, and blood pressure may become higher or still be elevated.

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.
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.
Addisonians may be misdiagnosed with gastrointestinal disease, dehydration, kidney disease, pancreatitis, a ruptured bladder, or certain types of poisonings. The only way to definitively diagnose Addison`s disease is through an ACTH stimulation test.
Addisonian patients may present with lethargy, diarrhea, vomiting, increased thirst, increased urination, and unplanned weight loss. Intermittent shaking episodes are sometimes seen. The signs may wax and wane.
3- What are the signs of parvo? Puppies become very quiet and lethargic. They may drool excessively and have a tender abdomen. Vomiting, bloody diarrhea and fever are the advanced symptoms and cause the severe dehydration associated with parvo.
Several days after the appearance of early symptoms, a distinctive bright red rash may appear on your child`s face — usually on both cheeks. Eventually it may spread to the arms, trunk, thighs and buttocks, where the rash has a pink, lacy, slightly raised appearance.
Other more serious reasons for a dog being sick include infection, worms, eating foreign bodies such as socks or toys, or swallowing or licking certain flowers, plants or toxins that are poisonous to dogs. More critical medical issues such as cancer or kidney, liver, or pancreatic disease could also be to blame.
Little or negative socialization

You might find your dog become aggressive, shy, or fearful around other humans or animals. Lack of socialization may even cause depression spells. You may witness your dog develop irregular sleeping and eating patterns, or it may refuse to play.

Most dogs with a GI obstruction have severe abdominal pain as well as a lack of appetite. A classic sign of pain is the bowing down position. Your dog may not want to be touched on the tummy. Or she may groan and be tense and wide eyed when you touch her there.
Early Symptoms of Intestinal Blockage in Dogs

Some dogs may be immediately put off by food with others just not eating as much. Some of that food may make its way through, or a dog may always vomit a meal back up, even a couple of hours later.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. She tends to flopp down and very sleepy drools and throws up but its just sliva and she shakes
ANSWER : A. It sounds like your dog may have a serious neurologic issue, illness or may have gotten into a toxic substance that is causing her to be nauseated or have changes in cognition and behavior. It is best to seek veterinary care ASAP if her symptoms continue.

Q. My cat just started drooling. Our local vet who did blood work and X-rays but can’t figure out what he’s drooling. Any ideas as to why that might be?
ANSWER : A. If he hasn’t had a sedated oral exam, that needs to be done. There can be items lodged in the mouth that can cause excessive drooling, as can dental disease. Sometimes there are nerve issues, so a good neurologic exam should be done as well. Feline infectious peritonitis, which is harder to diagnose, should be considered as well. Probably the most common thing I’ve seen causing drooling in cats is the ingestion of irritating plants or very noxious or bitter substances.

Q. My. Dog seems to be eating grass and throwing up is it true dogs eat grass To settle their stomach
ANSWER : A. If the dog pukes after he has eaten grass, then he ate the grass too late to help settle his tummy. Yes, they do use grass to settle their tummies.. it’s sort of like us eating lots of fiber. If he is throwing up every meal, AND throwing up water.. you may need to bring him to the vet. If he just throws up once or twice, I wouldn’t worry too much about it as long as he is drinking water and keeping it down.

Q. My dog is lethargic, he is panting and drooling, dripping saliva from his mouth, he is listless, he’s vomited, and he shakes all over. What’s wrong?
ANSWER : A. He may have eaten something he shouldn’t have and has an upset stomach and is nauseated, hence the drooling and vomiting. If what he swallowed was a non-food item, such as a toy or a small piece of plastic or other foreign material, it may be caught somewhere in his intestinal tract and is causing pain, which produces the shaking and lethargy. I recommend getting him in to a vet or emergency clinic right away, if he has an intestinal obstruction, it can be life-threatening if left untreated.

Q. Cat is drooling , doesn’t seem uncomfortable , maybe tired. Approx 10-12 years old
ANSWER : A. If you can do it safely, check the teeth and gums. If you see significant plaque buildup or red, swollen gums, this may be the cause of the drooling. Have your cat examined by your vet to determine if there is periodontal disease. Nausea can also cause drooling. Withhold food for 12 hours. Allow small amounts of water. Feed a bland diet until the drooling resolves. If it doesn’t, see your vet. Make sure your cat didn’t get into anything toxic also.

Read Full Q/A … : Symptoms Questions & Answers

Q. My 12 y/o neutered male indoor cat is severly overweight. Over the past week or so, he is drooling blood tinged drool, leaving stains and hiding away
ANSWER : A. The blood-tinged drool could be a sign that he has a broken or abscessed tooth, both of which are very painful conditions that need to be addressed with a dental procedure. Cats can also get tumors in their mouths that bleed intermittently. He needs to be seen by a vet who can do a good oral exam and figure out the source of the bleeding in the mouth. Also, if he’s hiding, he likely doesn’t feel well, since this is a common behavior in cats that are ailing. Get him in to see a vet ASAP.

Read Full Q/A … : Vetinfo

Q. My cat throw up his dry food and then when there was nothing left to throw up he was throwing up Bilt I think. Now he’s hiding
ANSWER : A. Starve him for 12 hours and then gradually reintroduce food. If the vomiting continues or he is extremely lethargic then contact your vet or emergency vet as soon as possible.

Q. My dog ate some leaves while we were walking and immediately after his head (just his head) started shaking. What happened?
ANSWER : A. Look in his mouth if he will allow. There could be plant matter stuck in his teeth or gums. The leaves may have been irritating as well. If he is drooling or continues shaking, try to rinse his mouth with cool water for 10-15 minutes. If that doesn’t help, seek veterinary attention.