This is embarrassing - rather shameful. Kinda not sure where else to ask for advice - Zazu is marking right by the front door, I'm trying my best to keep my eye on him and prevent it happening but I cannot watch him 24 hours a day. He is improving. He is cocking his leg so it's going down the edge seem of my carpet and going through to the underlay. Normally he doesn't cock his leg for an actual wee. Tried the biological washing powder and water mix, even invested in a carpet cleaner - it has helped but not massively. Even pulled the carpet up to clean underneath - let it dry. Tried adding Zoflora too - feel like it's masking the smell rather than removing it. Obviously being by my front door I'm highly conscious - I don't want it stinking. Are there any professional products which will help remove the smell? Before I rip up the carpet and underlay - bin it and cry.