Most infections in dogs require some form of veterinary treatment, but the approach varies widely depending on whether the infection is bacterial, fungal, or located in the skin, ears, or urinary tract. Some surface-level skin infections can be managed with topical treatments alone, while deeper or systemic infections need oral medications and close monitoring. Here’s what treatment looks like for the most common types of canine infections and what you can safely do at home to support healing.
Skin Infections: Topical vs. Oral Treatment
Bacterial skin infections (called pyoderma) are one of the most common reasons dogs end up at the vet. They show up as red bumps, crusty patches, hair loss, or hot spots, and they’re usually caused by bacteria that naturally live on your dog’s skin but have overgrown due to allergies, moisture, or a break in the skin.
Current veterinary guidelines strongly favor topical therapy over oral antibiotics for surface and superficial skin infections. This shift is driven partly by the rise of antibiotic-resistant bacteria in dogs, particularly resistant staph infections. A chlorhexidine-based shampoo (4% concentration) used twice weekly, combined with a daily chlorhexidine spray, has been shown to be as effective as oral antibiotics for superficial pyoderma. This holds true even for infections caused by resistant bacteria.
For localized infections, like a single hot spot or a small patch of irritated skin, your vet may prescribe a topical ointment or spray rather than a full-body shampoo routine. Deeper infections that extend below the skin surface, or infections that cover large areas of the body, typically do require oral antibiotics. Your vet will make that call based on how far the infection has spread and how your dog is responding.
Ear Infections
Ear infections are extremely common in dogs, especially breeds with floppy ears or those that swim frequently. You’ll usually notice head shaking, scratching at the ears, redness inside the ear flap, or a dark or yellowish discharge with a noticeable odor.
Treatment starts with a thorough cleaning. Your vet will gently flush the ear canal and dry it, because built-up discharge and wax can actually block topical medications from working. At home, saline eye solution is the safest option for cleaning. Avoid over-the-counter ear cleaners, wax removal liquids, vinegar dilutions, and other home remedies, as these can irritate inflamed tissue and make the infection worse.
Most prescription ear drops contain a combination of three ingredients: an antibiotic, an antifungal, and a steroid to reduce swelling and pain. For outer ear infections, topical treatment is generally more effective than oral medication. Oral antibiotics are reserved for middle ear infections, and those should only be chosen based on a bacterial culture so the right drug is matched to the specific bacteria involved.
Urinary Tract Infections
If your dog is urinating more frequently, straining to pee, having accidents indoors, or producing cloudy or bloody urine, a urinary tract infection is a likely cause. Your vet will confirm it with a urine sample before prescribing anything.
For uncomplicated UTIs, the first-line antibiotics are amoxicillin or a trimethoprim-sulfonamide combination. These are well-established choices that work against the bacteria most commonly responsible for canine UTIs. A standard course runs about 7 days, though some vets prescribe up to 14 days depending on the severity. Research is ongoing into whether shorter courses of 3 to 5 days might be just as effective, but there isn’t enough data yet to make that the standard recommendation.
Dogs with recurring UTIs or those with underlying conditions like diabetes or kidney disease may need a urine culture to identify the exact bacteria and determine which antibiotic will work best. These complicated cases often require longer treatment and follow-up testing to confirm the infection has cleared.
Yeast and Fungal Infections
Yeast infections in dogs typically affect the skin and ears, causing intense itching, a musty or corn-chip-like smell, greasy or flaky skin, and thickened or darkened patches. Dogs with skin folds, allergies, or chronically moist skin are especially prone.
Treatment begins with bathing. After an initial wash to remove buildup, you’ll switch to an antifungal shampoo containing chlorhexidine, miconazole, or ketoconazole. The shampoo needs to stay on the skin for at least 10 minutes to be effective. This bathing routine is repeated every 3 to 5 days and may continue for anywhere from 2 to 12 weeks depending on how stubborn the infection is.
For infections limited to the ears or just one or two small spots, a topical ointment applied daily may be sufficient. More widespread or persistent yeast infections require oral antifungal medications like ketoconazole, itraconazole, terbinafine, or fluconazole. These are highly effective but require prolonged courses, often several months, so patience is important.
Cleaning Wounds at Home
For minor cuts, scrapes, or surface wounds, you can do basic first aid before seeing a vet. The best option for flushing a wound is diluted chlorhexidine solution. If you have a 2% chlorhexidine concentrate, mix 2 tablespoons into 1 gallon of clean water. This creates a gentle antiseptic rinse that won’t damage tissue.
You might be tempted to reach for Neosporin or another triple-antibiotic ointment from your medicine cabinet. While bacitracin and polymyxin B (two of the three ingredients) are considered safe for animals, neomycin, the third ingredient, has been linked to hearing loss and isn’t recommended for dogs without veterinary guidance. The bigger practical issue is that most dogs will lick the ointment off, which defeats the purpose and can cause vomiting or diarrhea from both the medication and the lubricant base. If the wound is somewhere your dog can reach with their tongue, topical ointments aren’t a great choice unless you can keep a cone on them.
Supporting Gut Health During Antibiotics
Antibiotics don’t just kill the bacteria causing the infection. They also disrupt the beneficial bacteria in your dog’s gut, which can lead to diarrhea, decreased appetite, and general digestive upset. Probiotic supplementation can help offset this damage.
In a controlled study, dogs given a probiotic supplement starting on the first day of antibiotic treatment maintained significantly higher gut bacteria diversity compared to dogs that received antibiotics alone. Dogs without probiotics saw a notable increase in harmful bacteria associated with antibiotic-induced gut disruption, while the probiotic group maintained healthier populations of beneficial, gut-protective bacteria. Starting a veterinary-formulated probiotic on the same day as antibiotics, and continuing for at least two weeks, appears to meaningfully support recovery of the gut microbiome.
Signs an Infection Has Become an Emergency
Most infections are treatable and not immediately dangerous, but any infection can potentially spread to the bloodstream and become life-threatening. Knowing the warning signs of sepsis can help you act fast.
Early signs include a body temperature above 103.5°F or below 100°F, a heart rate above 160 beats per minute, rapid breathing, and lethargy or loss of appetite. If you check your dog’s gums, they may appear brick red or dark red rather than their normal pink, and pressing on the gum should produce a color change that snaps back in under a second. As sepsis progresses, the gums turn muddy gray and dry, the color return slows noticeably, and your dog’s pulse weakens. At this stage, your dog may feel cold to the touch and become unresponsive or disoriented. Any combination of these signs, especially a very high or very low temperature paired with lethargy, warrants an immediate trip to an emergency vet.