Antifungal Dog Shampoo: How They Work, When to Use & Top Ingredients (2026)

Antifungal dog shampoos are medicated grooming products used to treat yeast and fungal skin infections in dogs. When your dog has recurrent skin odor, rusty paw staining, or persistent itching that hasn’t resolved with regular shampoo, an antifungal formula may be what’s needed.

This guide is for informational purposes. Consult your veterinarian before starting medicated shampoo treatment, especially for recurring or severe infections.

What Is Antifungal Dog Shampoo?

Antifungal dog shampoos are medicated formulas containing pharmaceutical-grade antifungal agents — most commonly ketoconazole, miconazole, chlorhexidine, or selenium sulfide. They work by disrupting the cell membrane of fungal organisms, either killing them (fungicidal) or stopping their reproduction (fungistatic).

They’re primarily used to treat Malassezia (yeast) overgrowth on the skin and paws, which is extremely common in dogs — particularly those with allergies, skin folds, or frequent moisture exposure. They’re also used for ringworm (a fungal infection despite the name) and some other superficial fungal conditions.

See our general guide on dog shampoo types for context on how antifungal products fit into the broader landscape of dog grooming products.

Signs Your Dog Needs Antifungal Shampoo

The following signs suggest a fungal (yeast) infection that may benefit from antifungal shampoo treatment:

• Musty or “corn chip” odor (sometimes described as Fritos-like) — caused by Malassezia metabolites. Often strongest from the paws, ears, and skin folds.
• Rusty brown staining on the paws, groin, or belly from chronic licking — a combination of porphyrin (from saliva) and yeast pigmentation
• Greasy, flaky, or thickened skin with a yellowish scale, particularly in skin folds
• Circular, scaly patches of hair loss that may indicate ringworm
• Recurrent skin infections that partially respond to treatment then return
• Ear infections alongside skin issues — Malassezia is a common cause of dog ear infections too

Note that yeast overgrowth is very often secondary to an underlying cause — most commonly skin allergies. Treating the yeast infection alone without addressing allergies may provide short-term relief but not lasting resolution.

Related reading: dog paw yeast infection guide

Key Active Ingredients in Antifungal Dog Shampoos

Ketoconazole (1-2%)

One of the most effective antifungal agents available. Broad-spectrum — works against Malassezia yeast and dermatophytes (the fungi causing ringworm). Often combined with chlorhexidine for a dual antifungal + antibacterial effect. Very well tolerated by most dogs; some prescription-strength formulas are available for severe cases.

Miconazole (2%)

Similar spectrum and effectiveness to ketoconazole. Often found in over-the-counter veterinary products. Commonly paired with chlorhexidine. Well-established safety profile.

Chlorhexidine (2-4%)

Primarily an antibacterial, but has some antifungal activity at higher concentrations. Extremely useful in shampoos because most dogs with yeast infections also have secondary bacterial infections. Products combining 2% miconazole + 2% chlorhexidine are among the most recommended veterinary shampoos for mixed skin infections.

Selenium Sulfide (1%)

Antifungal and antidandruff agent. Effective against Malassezia and seborrheic dermatitis. Less commonly used now that ketoconazole/miconazole products are widely available.

Benzoyl Peroxide

Primarily antibacterial and keratolytic (removes scale and dead skin). Not antifungal itself, but useful in shampoos treating mixed bacterial-yeast infections with heavy scale. Can be drying with overuse.

Source: Veterinary Dermatology, Merck Veterinary Manual, 2025

How to Use Antifungal Dog Shampoo Correctly

Contact time is the critical factor — unlike regular shampoo, antifungal shampoos need to remain on the skin for several minutes to be effective. Rinsing immediately defeats the purpose.

1. Wet the coat thoroughly with warm water before applying
2. Apply the shampoo generously, working it into the skin (not just the coat surface)
3. Lather and massage into all affected areas, including between toes, under armpits, and in skin folds
4. Leave on for 5-10 minutes (read the specific product label — contact time varies)
5. Rinse completely with warm water until no residue remains
6. Repeat frequency per vet guidance — typically 2-3 times per week initially, then weekly for maintenance

For spot treatment of paws, a small bowl soak (applying shampoo, waiting 5 minutes, rinsing) is highly effective for paw yeast infections.

Antifungal vs Regular Dog Shampoo

Regular dog shampoos clean and condition the coat but contain no active pharmaceutical agents. They cannot treat infections. Conversely, medicated antifungal shampoos are not designed as everyday cleaners — most shouldn’t be used more than 2-3 times per week, and many aren’t safe for daily use. Use the right tool for the job: regular shampoo for maintenance grooming, antifungal shampoo for treating infections. Work with your vet on the right protocol for your dog’s specific situation.

For professional grooming with medicated products, find a pet groomer near you through HeiBob.