Bichon Frise ear scratching after medicated shampoo

Skin allergies are genuinely one of the most exhausting things to deal with as a dog owner — chronic, difficult to pin down, and rarely fixed by a single solution. The fact that your vet prescribed a medicated shampoo and your Bichon is still scratching their ears tells me the shampoo is probably treating the surface while something else is driving the inflammation underneath. To point you in the right direction: what breed and age is your dog, what exactly are the symptoms beyond the ear scratching, is it worse at certain times of year, and has your vet done any allergy testing or just prescribed the shampoo?

That pattern makes a lot of sense for a Bichon of her age. The seasonal spikes suggest environmental allergens — pollen, mould spores — but the fact it's now year-round means she's likely sensitised to something that's always present too, possibly dust mites, which are the number one indoor trigger for this breed. The head shaking and face rubbing alongside the ear scratching is a classic atopic triad in Bichons. One important question: when the vet examined her ears, did they find any yeast or bacterial infection, or were the ears described as just inflamed? And is there any smell or dark waxy discharge from the ears?

Right, so the chlorhexidine shampoo was never really going to resolve this — it's a skin cleanser, not an ear treatment, and recurring yeast in the ear canal needs something targeted directly inside the ear on an ongoing maintenance basis. The drops cleared the active infection, but without addressing the underlying allergy that keeps creating the warm, moist environment yeast thrives in, it will keep returning. Has she had any change in diet recently, and is she on any regular flea or parasite prevention? I want to rule out a food component before I give you my recommendation.

Four years on the same food is actually useful information — dogs can develop food sensitivities to proteins they've eaten repeatedly, and chicken-based kibble is one of the most common triggers in Bichons. That's worth addressing separately with your vet, possibly through a hydrolysed protein or novel protein diet trial. But for the immediate ear problem, here's what I'd recommend: Zymox Ear Solution with LP3 Enzyme System. It's available on Amazon UK, it's specifically formulated to treat and prevent yeast and bacterial ear infections without antibiotics, and critically it keeps working as a maintenance solution — you can use it weekly once the infection is under control. It contains hydrocortisone to reduce the inflammation that makes her want to scratch, and the enzyme system actively breaks down the biofilm yeast hides in. It won't fix the underlying allergy, but it will stop the ear becoming the recurring misery it currently is while you work on the bigger picture with your vet.

Good question — and this is important: do not clean the ear out before applying Zymox. That's actually stated in the instructions. The LP3 enzyme system needs the organic matter in the ear to activate properly, so pre-cleaning reduces its effectiveness. Apply it directly into the ear canal, massage gently at the base, and let her shake. For long-term use, the hydrocortisone version is fine for an initial treatment period of around 7 to 14 days, then you'd switch to the non-hydrocortisone formula for ongoing weekly maintenance. It's widely used long-term by dog owners dealing with chronic yeast ears. Do loop your vet in on the food angle too — a proper diet trial with a novel protein food like venison or duck could significantly reduce how often this comes back in the first place.