Old dog nighttime accidents on carpet

Nighttime accidents on stair carpet from a dog who's never done this before — at 13, that's a classic sign of age-related changes, whether it's a weakening bladder, early cognitive decline, or simply not making it down the stairs in time. The important thing to know upfront: only enzyme-based cleaners actually eliminate pet odours permanently — anything else just masks the smell, and your dog will nose out the same spot and use it again. To point you to exactly the right product, a couple of quick questions: are these accidents fresh when you find them in the morning, or are some already dried and set in by the time you get to them? And how many stairs are we talking — a small landing area or a longer run of carpet?

Got it — set-in urine on carpet is the harder case because the uric acid crystals have bonded into the fibres, and that's exactly what enzyme cleaners are designed to break down. The frequency you're describing means you need something that works reliably at scale, not a product you have to use sparingly. Can I ask — has your vet seen him recently? I only ask because new incontinence in a 13-year-old Jack Russell can sometimes be managed with medication, which would reduce how often you're dealing with this. Worth a call if not.

Perfect — vet appointment is the right call. For the carpet, I'd go straight to Simple Solution Extreme Pet Stain and Odour Remover. It's a professional-strength enzyme formula specifically designed for set-in stains, and it's one of the few that actually works on dried urine rather than just fresh accidents. For your stairs, use it generously — the enzymes need to penetrate as deep as the urine did, so don't just dampen the surface. Spray, let it soak for 10 minutes, blot up, then let it air dry fully before your dog has access again. The 'Extreme' version matters here; the standard Simple Solution is fine for fresh stains but the enzyme concentration in the Extreme formula is noticeably stronger for old, set-in accidents. Available on Amazon UK in a large trigger-spray bottle which makes sense given you've got a full staircase to treat.

Yes — block access if you can, even just a baby gate at the bottom of the stairs while it dries. The smell that attracts him back is the uric acid, and until the enzymes have fully broken it down and the carpet has dried, it's still there even if you can't detect it. Once it's fully dry after treatment, the attraction is gone. If he keeps returning to one particular step even after treatment, do a second application — set-in stains on carpet sometimes need two rounds, especially if the urine has soaked through to the underlay.

Good luck with it — and with the vet appointment next week. Age-related incontinence in small terriers is often very manageable once it's diagnosed, so there's a decent chance you won't be dealing with this long-term. Simple Solution Extreme will handle the carpet in the meantime.