Bob the cat was neutered at 5 months old and shares a house with us and two older cats, he's now 3 years old. He's a fairly dominant cat with the other two and very confident. However, we've just moved house and he's started spraying. We've bought diffusers, got a couple of litter trays and are sticking to normal feeding routines but the little sod is still spraying. Any ideas on how to stop him? He will improve once he's allowed back out, but need to stop him in the meantime.