Why Does My Dog Have Bad Breath? Common Causes and Solutions

This pet health content was written by a veterinarian, Dr. Debora Lichtenberg, VMD. It was last reviewed September 12, 2024

If you have questions or concerns, call your vet, who is best equipped to ensure the health and well-being of your pet. This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. See additional information.

Why Does My Dog Have Bad Breath: Puppy Breath Explained

There’s normal puppy breath, which has a distinct odor, and then there’s sick puppy breath, where something abnormal may be causing a foul smell.

• Very young puppies often have a sweetish breath odor, commonly referred to as "puppy breath."

If you adopted your puppy at a young age, around 6 weeks old, you might already be familiar with this specific smell.

• Puppy breath typically fades by 8–10 weeks, though some believe it can last up to 6 months.

However, if you're wondering "why does my dog have bad breath" and the odor seems more unpleasant than expected, it could indicate a problem that should be checked by your vet.

Why I'm Not a Big Fan of Puppy Breath

Whether or not normal puppy breath is pleasant is controversial. Humans have a genetic predisposition to how their noses interpret specific smells, like puppy breath (genetic predisposition).

• Personally, I don’t care for it. To me, it smells like a heavy, sweet-sour, skunk odor.

Many people, however, experience a sweet, pleasant odor and are sad when their puppy outgrows the puppy breath stage (a sweet, pleasant odor).

• In fact, if you search for "puppy breath" online, you'll find many unscientific opinions claiming it exists to make people fall in love with puppies (make people fall in love with puppies).

Factors Responsible for Puppy Breath

The scientific explanation is also a bit unscientific.

While we don’t completely understand puppy breath, most veterinary dentists and experts conclude that a number of factors are responsible for puppy breath:

• Sometimes referred to as milk breath, puppy breath is most obvious during nursing and just after the pup is weaned. This is an insufficient explanation, however, since puppy breath lingers for several weeks after weaning.
• Puppy mouths are clean and healthy, harboring none of the oral bacteria common in older dogs.
• The GI tracts of puppies contain different bacteria and flora than do those of adults.

Why Does My Puppy Have Bad Breath?

Even if you’re not a fan of normal puppy breath, it shouldn’t smell foul or sick. If your puppy’s breath has a strong odor, here are 6 possible reasons for the smell:

Teething

The most common cause of bad or unpleasant puppy breath is teething, which affects some puppies more than others.

• As your puppy moves further from being weaned and enters the teething stage, their breath may change.

Here’s a general timeline of puppy tooth eruption:

• Baby (deciduous) teeth begin to erupt around week 2 or 3.
• By week 5 or 6, all 28 baby teeth are in place.
• Baby teeth start falling out between weeks 12–16.
• By 6 months, adult teeth have usually come in.

During teething, inflammation can occur, which sometimes leads to a metallic odor. Puppies might also experience issues with fractured baby teeth or sore gums from chewing on toys. Some puppies may bleed around their gums during this stage, contributing to the smell.

• Avoid giving extremely hard bones or toys to your puppy while they’re teething (extremely hard bones or toys). These can fracture their tiny teeth, making the process of losing baby teeth and getting adult teeth more complicated.

Veterinary dentists recommend rubbery toys like KONG, which you can fill with food or treats. Additionally, a cool washcloth is a safer alternative to ice, which can cause tooth fractures (teething).

Mouth Injury or Difficulty Cutting Teeth

Puppies chew on anything and everything while teething and growing (chew on anything and everything), making it common for them to injure their mouths.

• Minor injuries usually heal quickly, as the oral cavity tends to heal fast.

However, sometimes a foreign body like a piece of stick or toy can get stuck in the mouth, leading to a foul odor (foreign body).

• If your puppy’s breath smells particularly bad, it’s a good idea to consult your vet. Since most puppies get a series of vaccinations during this time, you can bring up tooth-related concerns at those appointments (series of vaccinations).

If the bad smell persists, or if your puppy shows signs of oral pain or difficulty chewing, visit your vet as soon as possible to address any underlying issues.

Puppy Dietary Indiscretion

"Dietary indiscretion" is a polite term veterinarians use to describe a puppy's non-discerning appetite. Essentially, puppies will eat just about anything they can get their teeth into, including poop (including poop).

• After eating something like dog poop, cat poop, garbage, or decaying leaves, your puppy’s breath may smell particularly bad.

Think of it like eating a meal filled with heavy garlic — it can affect your breath for the rest of the day! You might even be able to figure out what your puppy ate by sniffing. For example, cat poop is usually easy to identify.

• If you suspect your puppy’s bad breath is due to a recent meal of something unpleasant, the odor should clear up within a few hours or by the next day.

Monitor what your puppy eats. While bad breath is inconvenient, dietary indiscretion can lead to more severe issues, such as vomiting and diarrhea (vomiting and diarrhea) or even an intestinal blockage (intestinal blockage).

Indigestion

Does food cause bad breath? Most veterinarians agree that food itself doesn’t cause bad breath. However, certain types of puppy food may not agree with your dog, leading to indigestion.

• If your puppy has a sour stomach or struggles with digestion, you might confuse “bad breath” with an odor coming from the gastrointestinal (GI) tract.

This odor may also be accompanied by excessive belching, passing gas (passing gas), vomiting, or diarrhea. Consult your vet about possible food changes.

• Your puppy might need a bland diet for 1–2 weeks to resolve the indigestion. Afterward, gradually introduce new foods over the course of a week to see if symptoms improve.

Periodontal Disease

Young puppies rarely experience true dental disease. Most serious tooth or gum problems don’t occur until a dog is about 3 years old.

• It’s crucial to get your puppy used to getting their teeth brushed early on (getting their teeth brushed).
• Here are a few brushing tips:
• Introduce brushing by 6 months of age, or even earlier if possible.
• Brush your puppy’s teeth at least 3 times a week while they’re young.
• By age 3, brushing daily will help prevent periodontal and tooth diseases.

Metabolic Disease

In rare instances, a puppy’s bad breath can be due to metabolic diseases like kidney failure (kidney failure).

• Along with the breath odor, you may notice other signs of illness. Your vet will likely recommend blood tests to diagnose the issue.

On a much lighter note, check out this fake ad for a new fragrance that will appeal to people who love puppy breath:

How Oral Hygiene Affects Your Dog’s Breath

Maintaining proper oral hygiene is one of the most effective ways to tackle the question, "why does my dog have bad breath."

• Daily Brushing: Brushing your dog’s teeth daily can significantly reduce bacteria buildup.
• Dental Chews: Providing dental chews can help keep your dog’s mouth clean between brushings.
• Regular Vet Cleanings: Routine dental checkups with your vet are essential for preventing periodontal disease and bad breath.

By keeping your dog’s mouth clean, you can effectively reduce bad breath and improve overall oral health.

Common Medical Conditions Behind Bad Dog Breath

If you're asking "why does my dog have bad breath," it could be due to an underlying medical condition.

• Periodontal Disease: Gum infections, tooth decay, and plaque buildup are common causes of bad breath in dogs.
• Kidney Disease: When your dog’s breath smells like urine, it may be a sign of kidney failure.
• Diabetes: Sweet, fruity-smelling breath can indicate diabetes in dogs.
• Liver Disease: A foul odor paired with vomiting or yellowing gums may suggest liver issues.

If you suspect any of these conditions, consult your vet for a diagnosis.

When to Seek Veterinary Care for Bad Breath

Sometimes, answering "why does my dog have bad breath" requires professional help.

• Persistent Odor: If your dog’s breath smells rotten or persists despite regular care, consult a vet.
• Additional Symptoms: Bad breath combined with vomiting, diarrhea, or weight loss could indicate a serious condition.
• Pain While Chewing: If your dog struggles to chew or seems in pain, it could be a dental or medical issue that needs immediate attention.

Don’t hesitate to reach out to your vet if any of these symptoms occur.

Prevention Tips for Maintaining Fresh Breath in Dogs

To prevent the need to ask "why does my dog have bad breath," it's important to follow a few preventative steps:

• Brush Regularly: Make tooth brushing part of your dog’s routine.
• Choose the Right Food: High-quality food helps support digestion and fresh breath.
• Use Dental Chews: Incorporate dental treats into your dog’s diet for extra cleaning.
• Provide Fresh Water: Ensure your dog has access to fresh water, as hydration plays a role in oral health.
• Keep Your Dog's Water Clean and Flowing: When water is fresh, dogs are more likely to drink it. Automated "Set it and Forget it" systems like Always Full ensure water is never stale, which supports better hydration and ultimately fresher breath.

Regular preventative care can help keep your dog’s breath fresh and prevent serious dental issues.

Final Thoughts on Puppy Breath

Puppyhood is a magical time, but it can also be challenging.

• If you love the sweet smell of puppy breath, enjoy it while it lasts — it won’t be around for long.

However, if your puppy’s bad breath persists and doesn’t seem to be improving, it’s always best to consult your veterinarian to rule out any underlying health concerns.

Frequently Asked Questions (FAQ)

References

• Bellows, Jan, DVM, DAVDC. "Bad Breath in Dogs and Cats." Veterinary Information Network. June 21, 2016. https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4951287.
• Bellows, Jan, DVM, DAVDC. Small Animal Dental Equipment, Materials and Techniques. Wiley. 2019.
• Lobprise, Heidi B., DVM, DAVDC. Wiggs's Veterinary Dentistry: Principles and Practice. Wiley. 2018.
• “Stinky Dog Breath.” American Kennel Club. https://www.akc.org/expert-advice/health/stinky-dog-breath/
• “Bad Breath in Dogs: Causes and Treatment.” PetMD. https://www.petmd.com/dog/symptoms/bad-breath-dogs-causes-treatment
• “Bad Breath in Dogs.” PDSA. https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub/symptoms/bad-breath-in-dogs
• “Halitosis in Dogs.” VCA Hospitals. https://vcahospitals.com/know-your-pet/halitosis-in-dogs

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