My terrier has had the occasional slip up and peed indoors in the night time. Lately though this has become a regular occurance and not sure how to stop it. I've disinfected, got anti-pet pee sprays and restricted his water before he goes to bed. Also make sure he pees before we put him to bed, but still he does it in same patch. Is this attention seeking behaviour or something? Or should i be concerned that he isn't well and take him to vet?