Hibiclens is a 4% chlorhexidine gluconate solution, and it needs to be significantly diluted before you use it on a dog. The right dilution depends on what you’re treating: open wounds call for a very weak 0.05% solution, while skin infections on intact skin can handle a stronger mix. Getting the ratio wrong in either direction means the solution is either too weak to help or strong enough to irritate your dog’s skin.
Dilution Ratios by Use
The concentration you need determines how much water to add. Since Hibiclens starts at 4% chlorhexidine, here are the practical ratios:
- For open wounds or raw skin (0.05%): Mix 1 teaspoon of Hibiclens into about 1.5 cups (400 ml) of water. This is roughly a 1:80 ratio. The resulting solution should look barely tinted. This ultra-dilute concentration is the current veterinary recommendation for cleaning open skin wounds without damaging healing tissue.
- For intact skin with infections (0.5% to 1%): Mix 1 tablespoon of Hibiclens into 1 cup of water for approximately a 1% solution. For a milder 0.5% rinse, use 1 tablespoon per 2 cups of water. These strengths work well as leave-on rinses for bacterial skin infections, hot spots on intact skin, or between-the-toes irritation.
When in doubt, go weaker. A too-strong chlorhexidine solution can dry out skin, delay wound healing, and cause contact irritation, especially on broken or inflamed areas. A properly diluted solution still has strong antibacterial and antifungal activity.
How to Mix and Store It
Use clean tap water or distilled water to dilute Hibiclens. Measure the Hibiclens with a kitchen teaspoon or tablespoon and add it to the water, not the other way around. Stir gently. The solution should have a faint pink or blue-green tint depending on the Hibiclens formulation, but it shouldn’t look deeply colored at proper dilution levels.
Diluted chlorhexidine does lose potency over time. At room temperature, a diluted solution stays effective for about three months. If you refrigerate it, it lasts considerably longer. For the best results, mix a fresh batch every few weeks rather than making a large supply, especially if you’re treating an open wound where bacterial contamination matters most. Store it in a clean, sealed container away from direct sunlight.
How to Apply It
For skin infections or hot spots, you can apply the diluted solution as a rinse or soak. Saturate a clean cloth or gauze pad with the solution and gently hold it against the affected area for two to three minutes, then let the skin air dry. Chlorhexidine works best as a leave-on product because it binds to the skin and continues killing bacteria after the liquid evaporates. Rinsing it off with plain water immediately afterward reduces its effectiveness.
For wound cleaning, gently flush the area with the 0.05% solution using a squeeze bottle or a syringe without a needle. Let excess liquid drip away and pat the surrounding skin dry. You can repeat this once or twice daily depending on the wound.
After any application, prevent your dog from licking or chewing the treated area for at least 30 minutes. An e-collar or a light bandage works for this. Chlorhexidine is not meant to be ingested, and licking also removes the solution from the skin before it has time to work.
Areas to Avoid
Keep diluted Hibiclens away from your dog’s eyes and ears. Chlorhexidine can cause serious damage to the cornea and is ototoxic, meaning it can harm the inner ear structures and potentially cause hearing loss if it enters the ear canal, particularly if the eardrum is ruptured. For ear cleaning, veterinary-specific chlorhexidine ear products exist at much lower concentrations with different formulations designed for that purpose.
Also avoid using it on deep puncture wounds or surgical incisions unless your vet has specifically recommended it. These situations sometimes require sterile saline or a different antiseptic approach.
Why Not Use Hibiclens at Full Strength
At its original 4% concentration, Hibiclens is formulated for human presurgical skin scrubbing on intact, healthy skin. Dogs have thinner, more sensitive skin than humans, and the detergent base in Hibiclens at full strength can strip natural oils, cause dryness, and provoke irritation or allergic reactions. The 4% concentration is also far stronger than what veterinary guidelines recommend for treating skin conditions or wounds. Diluting it brings the chlorhexidine down to a level that kills bacteria effectively without harming tissue, which is the balance you want for healing.