[Lil V]

Hi
im not sure where to post this but im at my wits end. When i got my dog he was well trained and no trouble at all. Now he growls at my boyfriend constantly even if my bf just walk past him. Also he now goes to the toilet in the house whereever and whenever he feels like it. I have just come home and stood in another puddle of wee. When he does this i take him right up to it, tap his nose then put hin in another room but this does not appear to be working. Could I get some advice please? Its really making me sad.
Thanks