Enzyme cleaner for Cocker Spaniel marking

Your vet is giving you solid advice — enzyme-based cleaners are the only products that actually destroy pet urine odour at a molecular level, rather than just masking it. That matters especially with a marking dog, because if any scent trace remains, he'll keep returning to the same spots. To point you to exactly the right product: which surfaces is he marking most — carpet, hard floor, or upholstery? And are most of the stains fairly recent or have some had time to set in?

Got it — set-in urine on carpet is the toughest scenario because the crystals bond deep into the fibres and the underlay, and that's exactly what ordinary cleaners can't reach. A few quick questions about your dog: is he neutered? And does he mark indoors consistently in the same spots, or is it more random? That tells me whether we're dealing with a habit that's become territorial or something else worth flagging back to your vet.

That's classic territorial marking from an intact male — the front door especially, because he can smell other dogs passing outside. The good news is that once you properly neutralise those spots with an enzyme cleaner, you break the scent signal that's telling him to refresh the mark. For your situation — set-in stains on carpet and laminate from a repeat marker — I'd go with Rocco & Roxie Professional Strength Stain & Odour Eliminator. It's a well-formulated enzyme cleaner that's strong enough for old, layered urine deposits, safe on carpet and sealed hard floors, and it's widely used for exactly this kind of persistent marking problem. On carpet, soak the area generously rather than just surface-spraying — the enzymes need to reach the same depth as the urine did. Cover with a damp cloth for 10–15 minutes to stop it drying too fast, then blot dry. On the laminate, apply, leave for five minutes, and wipe clean.

With set-in stains you'll often notice a temporary intensification of the smell in the first few minutes — that's the enzymes working, not the product failing. Within 24–48 hours the odour should be gone for you and, more importantly, for him. If a heavily saturated carpet spot still smells after one treatment, do a second application — old deposits sometimes need two rounds. The other sprays you've tried were almost certainly surfactant or fragrance-based, which is why the smell kept returning; they were covering it, not destroying it. Enzyme cleaners don't leave any scent signal behind for him to reinforce.

That's worth discussing with your vet directly since they already know your dog, but the two things that make the biggest practical difference alongside thorough cleaning are: neutering (your vet can advise on whether that's appropriate at seven), and temporarily restricting access to the marking spots while the scent memory resets — a baby gate across the hallway for a few weeks can help a lot. Once the enzyme cleaner has done its job and there's no residual odour, many dogs simply stop returning to those spots because the trigger is gone. Keep the Rocco & Roxie to hand for any relapses — catching new marks within the first hour makes the job much easier.