What Causes Bad Breath In Dogs?

For anyone lucky enough to call themselves a pet parent, it goes without saying that they want the very best for their fur babies –  dogs aren’t just four-legged friends, but part of the family. Whether it’s a stomach virus, seasonal canine allergies, or something more serious, a pet owner never wants to see their faithful friends suffer. However, there are certain common health conditions that might be indicative of an underlying issue, and as pet owners, it’s important to remain aware of a canine’s overall well-being. Keeping this in mind, your dog’s dental health is just as important as it is for humans, and should therefore never be overlooked.

When it comes to halitosis in dogs, some people believe that just because it’s a dog, it’s normal for him to have bad breath. While it may simply be a build-up of bacteria in your pooch’s mouth from poor dental hygiene, persistent bad breath may be a sign that he’s suffering from other health problems related to his kidneys, liver function or gastrointestinal tract. In any case, chronic canine halitosis should be addressed right away and diagnosed by a trusted veterinarian. So then, what causes bad breath in a dog and how can it be fixed? This article will discuss the causes of bad breath in your dog, as well as treatment and prevention.

Some of the most common causes for bad breath in dogs may include:

  • Periodontal Disease: A steady build-up of plaque can lead to periodontal disease, one of the leading causes of your pup’s bad breath. As bacteria multiplies in your dog’s mouth, it can initially result in halitosis; if left untreated, poor dental hygiene may cause gingivitis (gum disease). Advanced-stage canine periodontal disease is not only painful but dangerous, possibly resulting in tooth loss and even organ damage (such as the kidneys and heart).
  • Teething: For anyone who’s owned a puppy or kitten, you are probably familiar with the unpleasant breath they have during teething. This is due to bacteria collecting at the gum line (where budding adult teeth are pushing out baby teeth); the build-up of bacteria often results in halitosis. Fortunately, “teething breath” naturally goes away after your pet is done teething. However, once they have their adult teeth, it’s imperative to incorporate regular tooth-brushing into your pooch’s daily routine to ensure optimal dental health.
  • Oral Disease: While gum disease (gingivitis) may be one of the more common sources of your pal’s bad breath, there are other oral diseases that might be the culprit. Both cancerous and benign growths can cause oral masses, which can lead to foul-smelling breath. Another condition, known as gingival hyperplasia, results in abnormal gum growth; this disease creates deep pockets where bacteria thrives and (you guessed it) – leads to bad breath. Get into the habit of examining your dog’s mouth on a regular basis to inspect his teeth and gums for any abnormalities, and schedule annual veterinary check-ups, which should include an oral examination during your visit.
  • Gastrointestinal Disease: Although it may not be as common as the other reasons we’ve listed so far, gastrointestinal disease and other issues may be behind your dog’s smelly breath. Your vet can properly determine whether or not your dog is suffering from an illness affecting his esophagus, stomach, or intestines, and advise next steps in the instance that he is sick.
  • Metabolic Disease: Another catalyst for your dog’s bad breath may lie in certain metabolic diseases; it may not be as frequent a cause as others that have been discussed, but is worth mentioning. Specific toxins in the blood and a disruption in metabolic balance can lead to sour-smelling breath; this secondary symptom is often linked with canine kidney disease.

Canine Dental FAQs: Why Is My Dog’s Breath Bad?

According to an article in Vet Street.com, research has shown that 80% of dogs will display signs of canine periodontal disease after the age of 3 years, with studies indicating it’s one of the most frequent causes of bad breath in pets. The bacteria in your pooch’s mouth eventually turns into a sticky build-up on his teeth and gums know as plaque, and can lead to gingivitis, a painful condition that results in inflammation of the gums. However, dental problems are not the same for dogs as they are for people: while humans experience tooth decay (a loss of calcium in the tooth enamel, resulting in painful cavities), tooth decay in dogs is actually a rare occurrence. The most common dental problems for dogs are the result of either fractured teeth or canine periodontal diseases. Read on for some frequently-asked questions concerning your dog’s dental health:

Q: What Are Symptoms Of Excess Plaque In My Dog’s Mouth?

A: There are certain red flags to keep an eye out for when routinely examining your dog’s mouth, including:

  • Swollen or inflamed-looking gums; bleeding gums
  • Discoloration of the teeth
  • Tooth loss
  • Chronic bad breath (halitosis)
  • Pus inside the mouth (specifically around the teeth/gums)

If you notice any of these signs or symptoms, be sure to schedule an appointment with your vet, who can provide a thorough examination and determine the next course(s) of action, whether it includes a change in diet, implementing a dental care routine, or in extreme cases, surgery.

Q: Are Plaque and Tartar The Same?

A: Many people believe that plaque and tartar are the same, when in fact, they are not: while plaque is a soft colorless film that coats the teeth and gums (a result of the chemical breakdown of food in the mouth), tartar is what plaque becomes if not removed regularly – minerals from the saliva cause the plaque to harden, turning it into dental calculus (aka tartar). This yellow or brownish-colored deposit forms a strong bond to the tooth enamel, and may only be removed by a trained veterinary professional. If you notice any signs of tartar build-up, it’s important to have it professionally removed as soon as possible to prevent further canine periodontal disease.


Q: What Is Canine Gingivitis?

A: Gingivitis is due to excessive tartar build-up, which happens when you don’t brush your dog’s teeth regularly; if left untreated, it can lead to tooth and even bone loss/deterioration in the jaw and mouth. Humans can also undergo this periodontal disease as a consequence of poor dental hygiene. Below, the stages and signs of canine gingivitis:

  • Early stages: bad breath; yellow or brown tartar build-up found on dog’s teeth
  • Secondary stages: