Experienced and professional animal trainer provide their insights in answering this question :
A. We need a bit more information than that. If there is any chance that it has eaten something toxic then you need to contact 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 :

Epilepsy, a neurological disorder, can affect dogs. Symptoms may include collapsing, jerking, stiffening, muscle twitching, loss of consciousness, drooling, chomping, tongue chewing, or foaming at the mouth. Dogs can fall to the side and make paddling motions with their legs.
Excessive drooling and licking paws can be a result of many things. It could be seasonal allergies, or it could be an anxiety response. Whatever is causing it, it`s always best to get to a vet to investigate.
The most common clinical signs of Horner`s syndrome are: drooping of the upper eyelid on the affected side (ptosis) the pupil of the eye on the affected will be constricted (miosis) the eye on the affected side often appears sunken (enophthalmos)
If your dog`s new and excessive drooling is limited to one side of the mouth, you might want to check for a local problem first. This could be excess tartar build-up, a cavity, or a foreign object lodged in the mouth near where the drool is coming from.
Most of the time twitching is just normal doggy behavior, but some cases may be due to factors like stress, advanced age or an underlying health condition. Here`s everything you need to know about dog twitching, including when you should take your pup to see a veterinarian.
As with other dog behaviors, there can be several reasons that lead dogs to lick or chew their paws. These include injuries; skin problems; environmental, parasite, or food allergies; and boredom or anxiety.
The age groups and breeds that are most affected by horner`s syndrome. Any age group can develop horner`s syndrome but most are 5-8 years of age. Common breeds affected are the Golden Retriever, Labrador retriever, Collie, Shetland sheepdog, Weimaraner, and Doberman pinscher. Both males and females are equally affected …
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.
` Drooling and dysphagia often accompany this clinical sign. The most common cause of acute-onset, inability to close the mouth (`dropped-jaw`) is trigeminal neuropathy (i.e. trigeminal neuritis), a disease process that is idiopathic, bilateral, non-suppurative and affects all motor branches of the trigeminal nerve.
Licking lips and swallowing is as completely normal in dogs as it is in humans! Some dogs will lick their lips to hydrate them when they feel dry, others may lick their lips when they have something stuck there like a blade of grass or a piece of rogue food from dinnertime.
Symptoms can include collapsing, jerking, stiffening, muscle twitching, loss of consciousness, drooling, chomping, tongue chewing, or foaming at the mouth. Dogs can fall to the side and make paddling motions with their legs. They sometimes poop or pee during the seizure. They are also not aware of their surroundings.
ā€¨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 1 Kidney Disease

In stage one, there is a small amount to no protein in the urine, and the pup typically maintains normal blood pressure. However, diagnostic tests may indicate abnormalities in the urine concentration or irregular kidney palpation. Most dogs do not present with symptoms during this stage.

A lick granuloma, also known as acral lick dermatitis, occurs when a dog obsessively licks at an area, often on a lower limb, most commonly the wrist or carpal joint of the front limb. These dogs find a spot to lick and start a cycle of self-trauma, inflammation, and infection.
Licking is a natural and instinctive behaviour to dogs. For them it`s a way of grooming, bonding, and expressing themselves. Your dog may lick you to say they love you, to get your attention, to help soothe themselves if they`re stressed, to show empathy or because you taste good to them!
Dogs lick the air for a number of reasons: to better smell things they are interested in, to communicate anxiety, to combat an upset stomach, etc. Occasional, short-lived episodes of air-licking are not a cause for alarm, but you should watch for increases in the time and/or frequency spent licking.
Ptosis is when the upper eyelid droops over the eye. The eyelid may droop just a little, or so much that it covers the pupil (the black dot at the center of your eye that lets light in). Ptosis can limit or even completely block normal vision. Children and adults can have ptosis.
Third-order Horner syndrome results from damage to the nerve path that travels from your neck to your middle ear and eye. Problems may result from: Lesions on your carotid artery. Middle ear infections.
Horner`s syndrome is not painful and does not affect the dog`s vision, so treatment isn`t necessary. However, Horner`s syndrome indicates underlying nerve damage, and the cause may need addressing.
Horner`s syndrome is not life-threatening, but it may indicate a condition that is life-threatening in some cases. Horner`s syndrome occurs as a result of damage to the nerves that connect the brain to the eye and one side of the face.
Horner syndrome may result from any one of a variety of factors, including carotid artery dissection; the development of a tumor in neck or chest cavity, particularly a neuroblastoma and a tumor of the upper part of the lung (Pancoast tumor); the development of a lesion in midbrain, brain stem, upper spinal cord, neck, …
There is no treatment for Horner syndrome itself. Ptosis is very mild and in rare cases affects vision in Horner syndrome. This can be corrected by cosmetic surgery or treated with eyedrops.
The first sign of parvo for puppies is often lethargy, lack of appetite, and a fever. Canines will begin to suffer from vomiting and diarrhea as the virus progresses, and can experience dehydration and a high heart rate as a result.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. Drooling tongue sticking out of mouth. Left foot twitch
ANSWER : A. We need a bit more information than that. If there is any chance that it has eaten something toxic then you need to contact your emergency vet immediately.

Q. My dog is drooling heavily at the mouth. Thick green redish in color
ANSWER : A. That description looks like an abscess or any infection coming from the mouth, check the teeth and tongue, and will need vet atention to start an antibiotic course. Sometimes the infection can come from a lump try to explore the mouth properly, carefully because can be in pain.

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 has bad rotted loose teeth. She is older and when I got her it was this way. Now I am finding out more and want her to have better life quality
ANSWER : A. She will need dental treatment in order to remove any infected material in her mouth, which can cause heart and kidney infections if left in place long term. Any loose and damaged teeth should be removed as these are a constant source of discomfort and infection in her mouth. There are many home care options from brushing, medicated dental chews and mouth rinses to drinking water additives all of which will help to maintain a cleaner, healthier mouth after her dental procedure

Q. she is 6 yo. a while back started drooling constantly and always tounge sticking out and difficulty w/dry food now eats can food seems lazy sleep alot
ANSWER : A. This sounds like your pet may have a problem with her teeth. Cats in particular get little holes that spontaneously form their teeth kind of like cavities. They can cause excessive drooling and severe pain in the mouth. I recommend letting a vet examine her mouth because they know what to look for and she may need a dental cleaning and either filling in of the holes (not common practice and expensive) or just removal of the teeth to remove the source of pain .

Q. My dogs tongue looks like its peeling. A couple long stripes .
ANSWER : A. Peeling of the tongue may indicate that your dog had an allergy or burn on the tongue and it is now attempting to heal itself. If the tongue is actively peeling and bothersome to your dog, or if it is actively bleeding or your dog is unable to eat/breathe it is best to schedule a veterinary appointment ASAP to check for the cause of the issue. If you are seeing any other signs of illness in addition to the peeling tongue, alert your vet.

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. PLEASE HELP, PLEASE. MY KITTEN is foaming at the mouth!! We just gave her a bath and all of the sudden her mouth is foaming…My parents are at work!
ANSWER : A. Hi, when a cat foams normally means that she noticed a bad taste in the mouth, probably in your case some shampoo/soap went inside the mouth and is foaming. Rinse the mouth with plain water and she will be fine.