i have a 11 month old male english bulldog named biggie. its been 2 weeks now that he wont listen to any command i seem to give. he wont sit come or lay down. he is starting to nip me and he runs away when i call him. he seems to try to dominate me and i don't understand why?he was trained before and often listened really well. he even started to pee in the house . what can i do?