This is a specific conversation about Dog skin allergies — practical help — ask about yours and get one honest answer for your exact situation.
inparticular.ai
So your vet suspects a contact allergy — that's actually a useful starting point, because it narrows things down considerably. Contact allergies in older dogs are often triggered by something in their immediate environment: bedding materials, washing detergents, or grooming products they're regularly exposed to. The vet's instinct to look at what touches your dog's skin daily is exactly right. To help you find the most likely culprit, can you tell me a bit more — whereabouts on his body is the irritation showing up, and what detergent are you currently using to wash his bedding?
He's been scratching mainly around his belly and inner legs. We use a standard biological washing powder on his bed and blankets, whatever was on offer at the supermarket.
inparticular.ai
That pattern — belly and inner legs — is classic contact allergy territory. Those are the areas that press directly against bedding when he lies down, which fits perfectly with what your vet suspects. Biological powders are a very common offender: the enzymes in them that break down stains can be quite harsh on sensitive skin, and fragrances added to standard supermarket detergents are another frequent trigger. Switching to a fragrance-free, non-biological liquid is usually the first and most impactful change to make. How often are you currently washing his bedding?
Probably once a week, sometimes less. Should I be doing it more often?
inparticular.ai
Twice a week would be better while you're trying to get this under control — you want to reduce the build-up of allergens and skin cells in the fabric. But washing more frequently only helps if you switch the detergent at the same time, otherwise you're just reapplying the irritant. The product I'd point you to is Surcare Non-Bio Laundry Liquid. It's fragrance-free, enzyme-free, and specifically formulated for sensitive skin — it's widely used by people with eczema for exactly this reason, and it works just as well for dogs. It's readily available on Amazon UK and reasonably priced. Use it on everything that contacts his skin: bed, blankets, any soft toys he sleeps with.
That makes sense. Should I also be checking his shampoo and anything else we put on him?
inparticular.ai
Yes, absolutely — your vet is right to flag that. Go through anything that touches his coat or skin: shampoo, conditioner, any spot-on treatments, even the material of his collar if it's synthetic. For now, if you can simplify to just washing bedding with Surcare and bathing him with plain warm water while you wait to see if things improve, that gives you a cleaner baseline. If the irritation settles over two to three weeks, you can start reintroducing products one at a time to identify if any of them were contributing. Is he on any regular grooming products at the moment?
We use a conditioning spray after brushing, and a standard dog shampoo every few weeks. Nothing prescription.
inparticular.ai
The conditioning spray is worth pausing for now — sprays tend to have more fragrance and alcohol than rinse-off products, and with contact allergies those sit on the coat rather than washing off. Put it aside for a month and note whether things improve. For the shampoo, switch to something simple and unfragranced; a colloidal oatmeal shampoo is a good choice for irritated skin — gentle, soothing, and very unlikely to aggravate things. But the bedding detergent switch to Surcare is your most important first move, given how much time he spends lying down. Make that change this week and keep a note of how his skin looks over the following fortnight to share with your vet at the follow-up.