Unlike a dog, drooling is not a normal part of the cat experience. When your cat leaves a damp spot on the lap or on the floor, it’s natural to feel worried. It’s important to recognize that drooling isn’t a standalone diagnosis or condition. Instead, it’s a symptom of trouble that can be associated with a wide spectrum of situations, ranging from a “happy drool” signaling contentment (yes, it can happen) to a medical problem that needs veterinary attention.To help you distinguish between the two, I will break down the most common explanations for kitty drooling, highlighting which should be considered a cause for concern. Knowing when to simply wipe it away and when to pick up the phone to call your vet can make all the difference in keeping your cat safe, happy, and healthy!The “Happy Drool”Before panic sets in, there are a select few very specific situations where a little bit of cat drool is no cause for alarm. Take a moment to consider the details surrounding your cat’s drooling and whether it could definitively be connected with one of the following cases. This type of drooling is typically temporary, mild, and stops immediately once the context changes, allowing you to take a deep breath and relax. The Purr Drool Believe it or not, excessive happiness is the most common normal reason a cat will drool, making them not all that different from their canine counterparts. This behavior is a direct, neurological link back to their kittenhood and the nursing reflex. When kittens nurse, they instinctively knead on their mother’s belly to stimulate milk flow. This action, combined with the satisfaction of a full belly, creates a powerful association. As adults, when a cat feels incredibly safe, content, or loved, it may trigger this same reflex, causing your cat to purr and knead (often referred to as “ making biscuits”), which in turn can stimulate the salivary glands. They could literally be so happy that they forget to swallow. Purr drooling is almost always accompanied by: Loud purring Kneading on a soft surface or your lapA completely relaxed, blissful expressionIt stops the moment the petting or purring stopsA Stress ResponseWhile this isn’t a happy explanation, it’s still one that brings little overall worry. Feelings of stress, anxiety, and fear can also trigger a similar (and temporary) physical reaction. When feeling a heightened state of anxiety, your cat’s body can release stress hormones that affect the digestive system and salivary glands, causing them to produce more saliva than normal. This increase in saliva may escape their mouth, leading to drooling. This is most often seen during car rides (due to motion sickness or fear), vet visits, or exposure to loud, sudden noises like thunderstorms and fireworks. The drooling is generally short-lived and will stop once the source of their stress is removed. Watch for other signs of stress, such as wide eyes, flattened ears, excessive vocalization, or hiding. Bad Tastes or Bitter Medication Cats have extremely sensitive palates, and anything that is bitter, foul-tasting, or irritating will trigger an immediate flood of saliva to wash the substance out of the mouth. This is a quick defense response, with the body trying to dilute and flush out the unpleasant or irritating substance. It’s likely rooted in the fact that toxins generally have a bitter taste. If this occurs after your cat has been given liquid medication or an improperly coated pill that tastes bitter, it will stop as soon as they successfully swallow the medication and the taste clears from their mouth. You can try using pleasant forms of medication delivery that help mask the taste, such as pill pocket treats or incorporating a tasty broth. Always check with your veterinarian before mixing your cat's medication with any other substance. However, if the drooling is prolonged or accompanied by foaming, it shifts from being a benign and inconsequential reaction to a potential sign of toxicity, which I will discuss later. The “Worry Drool” If your cat’s drooling is persistent, excessive, new, or accompanied by other signs of trouble, there is a good possibility that it is caused by an underlying health issue. This type of drooling requires a prompt call to your veterinarian so they can do a thorough exam and identify the root cause. Unlike the “Happy Drool,” which is fleeting and linked to emotion, this “Worry Drool” is caused by a physical problem that is either causing them to produce more saliva than usual or preventing them from swallowing saliva normally. Here are the most common and serious medical explanations for excessive drooling in cats, organized by the body system they affect: Dental and Oral Disease (The Most Common Culprit)Experts estimate that anywhere between 50 and 90% of cats over the age of four will suffer from some form of dental disease, making this a surprisingly common struggle. When faced with the pain and irritation caused by dental problems, your cat’s body may produce more saliva to try to soothe the pain. Unfortunately, the pain itself often makes swallowing difficult. The most common dental problems your cat may be facing include: Periodontal Disease and Gingivitis: Inflammation and infection of the gums and supporting structures of the teeth can cause chronic pain and irritation, leading to drooling. Feline Odontoclastic Resorptive Lesions (FORLs): These are extremely painful erosions of the tooth structure, often at the gum line. They are equivalent to severe cavities and can cause very painful sensitivity, as well as excessive salivation. Oral Ulcers and Infections: Sores in the mouth caused by chronic diseases (like advanced kidney failure) or acute infections (like feline calicivirus) are excruciatingly painful and lead to constant drooling. Oral Trauma: Injuries such as a fractured tooth, a cut on the cheek or tongue, or a broken jaw from an accident or a cat fight will cause pain and an inability to properly close the mouth, causing your cat to drool. If your cat’s drooling is caused by oral pain, you may notice they have developed noticeable bad breath or started to show unexplained weight loss. Due to pain and discomfort, they may be reluctant to eat (especially dry or crunchy food) or may drop food from their mouth while eating. Any of these warning signs warrants a vet visit.
