Why Does My Dog Have Bad Breath and How to Fix It
Is Dog Bad Breath Normal?
A slight "doggy" smell from your dog's mouth is normal. But truly offensive bad breath — particularly a sour, sweet, or faecal odour — is a sign that something needs attention. Halitosis in dogs is almost always preventable and treatable once you identify the cause.
The Most Common Causes of Bad Breath in Dogs
1. Plaque and Tartar Build-Up
By far the most common cause. Bacteria in the mouth form plaque daily. If not removed by brushing or chewing, plaque hardens into tartar within 72 hours — creating the perfect environment for odour-producing bacteria to thrive. This is the cause for the vast majority of dogs with bad breath.
2. Gum Disease (Periodontal Disease)
Untreated plaque leads to gingivitis (inflamed gums) and eventually periodontal disease, where the infection spreads below the gum line. This produces a distinctly foul, persistent odour and requires veterinary treatment.
3. Diet
Dogs that eat wet food, table scraps, or raid the bin tend to have worse breath than those on a consistent dry kibble diet. Raw feeding can also cause temporary odour from meat proteins fermenting in the mouth.
4. Coprophagia (Eating Faeces)
A common and deeply unpleasant cause. If your dog's breath smells distinctly faecal and you've ruled out dental disease, this is worth investigating. It's often a behavioural habit or nutritional deficiency.
5. Systemic Health Issues
Some causes of bad breath signal serious underlying conditions:
- Sweet or fruity breath: Can indicate diabetes.
- Urine-like or ammonia smell: May suggest kidney disease.
- Musty or liver-like smell: Associated with liver problems.
If your dog's breath has a distinctive unusual odour and they show other symptoms (lethargy, increased thirst, weight loss), see a vet promptly.
How to Fix Dog Bad Breath
Step 1: Start Brushing
The most effective long-term fix. Daily brushing with an enzymatic toothpaste removes the plaque that causes 90% of bad breath cases. See our full guide on how to brush your dog's teeth step by step if you're not sure where to start.
Step 2: Use a Dental Spray Daily
For quick, no-brush freshening, a dental spray applied directly to the teeth and gums kills odour-causing bacteria on contact. It's especially useful between brushing sessions or for dogs that resist toothbrushes.
The TinPaw Pet Dental Spray is alcohol-free, safe to swallow, and starts working in seconds.
Step 3: Add Dental Powder to Their Food
Dental powders work enzymatically to break down plaque and neutralise odour from within. Simply sprinkle over food once daily — no brushing required. Ideal as a standalone solution for resistant dogs or as a complement to brushing.
The TinPaw Dog Dental Care Powder combines teeth-cleaning and breath-freshening in one daily supplement.
Step 4: Introduce Dental Chews
The mechanical action of chewing scrapes plaque from tooth surfaces. Use dental chews daily as a supplement to — not a replacement for — brushing. Look for chews with the VOHC (Veterinary Oral Health Council) seal of approval.
Step 5: Book a Professional Clean If Needed
If there's visible brown tartar build-up, bleeding gums, or the bad breath persists despite home care, a professional dental clean under anaesthetic is likely needed. This removes tartar that cannot be addressed at home and gives you a clean baseline to maintain.
How Long Until Bad Breath Improves?
With consistent daily brushing and dental spray or powder, most owners notice a significant improvement within 2–4 weeks. Severe cases with established tartar may need a professional clean first before home care becomes fully effective.
