I think maybe he is jealous of the attention you give Couver. If my bf did that i would ask him why first of all and tell him to get over it lol Honestly i think its silly to be jealous over a pet(if that even is the reason). I guess you have to find out why first. Maybe he didnt want him or maybe Couver barks a lot outside? There has to be a reason...But my bf actually does the opposite, he tells me to bring them all lol I'm also your age btw