Why Is My Cat Drooling? (Hint: It’s Not Because They Are Thinking About Cheeseburgers)

I once had a cat that would drool when being pet, napping next to me, usually with her head down on my hand. I had never understood that. Then I found myself thinking of Homer Simpson and those pictures of him drooling over donuts. It occurred to me that Gracie must be just as happy. But while a slight bit of drool here and there is normal, cat drooling can sometimes be a sign that something not so innocent is occurring. Here’s what you need to know about why cats drool, and when it’s time to see a vet.

Grooming: Cats frequently drool when they groom themselves.

Activity or Relaxation: Similar to Gracie, some cats drool when they’re feeling very relaxed, happy or content, especially during cuddling or petting.

Treats and Food: Drooling is more commonly seen in dogs than in cats. It’s not unusual for a pet to drool excessively while waiting for dinner. If your pet licks up treats, there’s no need to worry about the drooling.

Some of the most common reasons for cats to drool are related to their dental or oral health issues:

• Gingivitis and Periodontal Disease: Inflammation and irritation in the gums and deep oral structures can create significant discomfort, leading to excessive saliva production.
• Trauma: If your cat has been involved in a fight or blunt trauma, it may have suffered a wound or laceration to its mouth, which could result in drooling. Trauma can also result in tooth or jaw fractures, leading to drooling secondary to pain or the inability to close the mouth.
• Stomatitis: Stomatitis is severe inflammation of the soft tissues lining the mouth, including the tongue, gums, cheeks and lips. This inflammation is so severe it causes pain, redness, swelling and ulcers. This can lead to trouble eating, resistance to closing the mouth, and ultimately, drooling.
• Oral Ulcers or Burns: When painful ulcers develop, it can be due to several factors. These factors include foreign body ingestion, burns (thermal or chemical), infection, or metabolic diseases like renal disease. The drooling that occurs is a reaction to the pain and discomfort caused by the irritation. Some signs that there could be a dental or oral problem include bad breath, pawing at or avoiding the mouth, refusing to eat or chewing unequally and red (or puffiness) around gums or tartar build-ups.
• Nausea and Gastrointestinal Problems: Conditions that cause nausea or vomiting, like gastrointestinal problems or motion sickness, can be other culprits behind drooling.
• Plants: Your cat, and kittens in particular, will naturally want to investigate bits of plants or fallen leaves. Poisonous plants can be corrosive and orally irritating, leading to direct irritation and ulceration of the mucosa. Other plants, like lilies, cause systemic disease (renal failure), which can lead to nausea, gastric ulceration, and oral ulceration.
• Toxins: Other toxic compounds like cleaning products or anti-freeze, act systemically, causing nausea and salivation.
• Medications: Have you ever tried to pill a cat? As soon as they get a small taste of a tablet or foul-tasting liquid medication, they start to foam and drool. Doxycycline is an example of a medication which, if given incorrectly, can cause esophageal stricture, which can lead to trouble swallowing and ultimately drooling.
• Foreign Objects in the Mouth: A piece of string, a splinter, or a bone fragment can get stuck in your cat’s throat or mouth, causing heavy saliva production.
• Stress and Anxiety: Physical symptoms exhibited by stress in cats can include drooling. These are usually noticed during car rides to the vets, any changes in routine or environment (even something as simple as moving your dog food bowl), loud noises and guests visit.

Tooth resorption happens when a cat’s body breaks down its own tooth structure. This common dental condition can be very painful, especially as damage exposes sensitive parts of the tooth. You might notice drooling, food falling from your cat’s mouth, chewing on one side, or a sudden preference for softer food. Some cats continue eating despite significant discomfort.

Because damage can occur below the gumline, a quick look in the mouth may not reveal the full problem. A dental examination and dental X-rays under anesthesia help identify affected teeth and guide treatment. Painful affected teeth usually require extraction or another appropriate dental procedure; brushing and antibiotics cannot repair the damaged tooth.

A growth in your cat’s mouth can make chewing and swallowing painful, leading to persistent drooling. Other signs may include bad breath, facial swelling, weight loss, or a reduced appetite. Some growths are hidden beneath the tongue or toward the back of the mouth, where they’re difficult to spot at home.

Not every oral growth is cancerous, but any new lump or persistent sore deserves a prompt veterinary exam. Squamous cell carcinoma is the most common oral cancer in cats and can invade nearby tissues. Your veterinarian may recommend a biopsy to identify the growth and imaging to assess its extent. Early evaluation helps clarify the available treatment options and how best to keep your cat comfortable.

Sneezing, watery eyes, and a runny nose may seem like a typical feline “cold,” but some respiratory infections also cause painful mouth problems. Feline calicivirus commonly causes ulcers on the tongue and other areas of the mouth. These sores can lead to heavy drooling and make eating uncomfortable. Feline herpesvirus is another common cause of upper respiratory illness, but it more typically affects the nose and eyes; mouth ulcers are more characteristic of calicivirus.

Contact your veterinarian if drooling occurs with respiratory symptoms, especially if your cat is eating less, seems unusually tired, or has painful eyes. Treatment may include pain relief, fluids, nutritional support, and medication tailored to the findings. Keep your sick cat separate from other cats and avoid sharing bowls or bedding, since these infections are contagious. Difficulty breathing requires immediate emergency care.

If your cat starts drooling after spending time in a hot environment, watch for panting, rapid breathing, weakness, confusion, or collapse. These signs can indicate heatstroke, a life-threatening emergency that can damage internal organs. Cats can overheat when trapped in places such as garages, sheds, or parked cars.

Move your cat to a cool, well-ventilated area and begin cooling them with cool tap water, keeping water away from their nose and mouth. Contact the nearest emergency veterinarian immediately and arrange transport. Offer drinking water if your cat is alert, but don’t force them to drink or wrap them in wet towels, which can trap heat. Even if your cat appears to improve, they still need veterinary attention.

Rabies can cause excessive drooling and difficulty swallowing, along with unusual behavior, weakness, loss of coordination, or seizures. Drooling alone does not mean your cat has rabies, but possible exposure to an infected animal needs immediate attention.

If your cat may have had contact with a rabid animal, call your veterinarian promptly—even if your cat seems well. If concerning symptoms are present, avoid handling your cat or inspecting their mouth, keep people and other pets away, and call your veterinarian or local animal control for instructions before transporting them. Anyone who has been bitten or had potentially infected saliva enter a wound, eye, or mouth should seek immediate medical advice. Keeping your cat’s rabies vaccination current is an essential preventive step.

While an occasional bit of drooling may not be anything to worry about, keep a watch out for any other signs that might suggest there is something more serious going on. If your cat’s drooling is sudden and unexplained, ongoing, or excessive, contact your veterinarian promptly. Do not wait 24 hours if your cat seems unwell or may have swallowed something harmful. If it is accompanied by other symptoms, such as bad breath or pawing at the mouth, that’s also a warning sign. Difficulty eating or chewing, discoloured, bloody, or foamy saliva, and refusal of food should not be ignored. Lethargy and noticeable swelling around a facial area are additional symptoms to watch for. In any of these cases, it’s best to contact your vet right away. Timely treatment for related medical problems is critical to ultimately relieve your cat of drooling. ​ The treatment of drooling is mostly governed by the underlying cause: ​

• Dental Problems: Recovery can include professional cleaning, extractions or antibiotics for infections and inflammation.
• Poison Exposure: Treatment may consist of decontamination, medications to ease oral pain, and fluids to remove toxins from the body.
• Nausea: Anti-nausea medicine and supportive therapy can help with in the issue.
• Trauma: Surgical intervention, analgesia and wound care may be necessary. ​ Prevention Tips: Regular professional dental check-ups and cleanings. Regular ‘at home’ oral exams as well, preferably on a daily basis if possible. Keep poisons and flowers, pills, cleaning products and cords, out of reach. Observe your cat’s demeanor and report on any differences. ​While an occasional bit of drooling may not be anything to worry about, keep a watch out for any other signs that might suggest there is something more serious going on. If your cat’s drooling is sudden and ongoing or excessive, lasting over 24 hours, it’s a concern. If it is accompanied by other symptoms, such as bad breath or pawing at the mouth, that’s also a warning sign. Difficulty eating or chewing, discoloured, bloody, or foamy saliva, and refusal of food should not be ignored. Lethargy and noticeable swelling around a facial area are additional symptoms to watch for. In any of these cases, it’s best to contact your vet right away. Timely treatment for related medical problems is critical to ultimately relieve your cat of drooling.

The treatment of drooling is mostly governed by the underlying cause:

• Dental Problems: Recovery can include professional cleaning, extractions or antibiotics for infections and inflammation.
• Poison Exposure: Treatment may consist of decontamination, medications to ease oral pain, and fluids to remove toxins from the body.
• Nausea: Anti-nausea medicine and supportive therapy can help with in the issue.
• Trauma: Surgical intervention, analgesia and wound care may be necessary.

Prevention Tips: Regular professional dental check-ups and cleanings. Regular ‘at home’ oral exams as well, preferably on a daily basis if possible. Keep poisons and flowers, pills, cleaning products and cords, out of reach. Observe your cat’s demeanor and report on any differences.

Drooling is a clue, but it doesn’t tell us the whole story. Your veterinarian will ask when it started, whether your cat is eating normally, and if there have been any changes in behavior, medications, or possible exposure to plants or chemicals. A physical exam includes checking the mouth for painful teeth, inflamed gums, ulcers, injuries, or something that shouldn’t be there.

Some problems hide below the gumline or toward the back of the mouth. Your vet may recommend an examination under sedation or anesthesia, with dental X-rays when needed. Depending on the findings, additional testing may include bloodwork, urine testing, or a biopsy of an unusual growth. Finding the underlying cause helps your vet choose treatment that addresses the problem and relieves your cat’s discomfort.

Occasional drooling during grooming and relaxation is natural for domestic cats. However, continued or excessive drooling often signals an abnormality. This may be related to their dental health, overall health, or the surrounding environment. In such cases, veterinary care is necessary.

At Ruby Veterinary Urgent Care, we take pride in the high level of care that we offer to your beloved cats. From diagnosing dental issues to treating systemic problems, we are prepared to treat many conditions. Keep an eye on your feline companion’s conduct and if you suspect your cat of drooling, don't be shy to call for help. When you understand the possible reasons for drooling and address them with veterinary care when necessary, you can maintain your feline friend's happiness and wellness.