First hi to everyone. My hunter and abby had a litter of 5 puppies 2 males and 3 females. Today we went to have their first shots. Back at home it was back to normal with them playing and sleeping. Well the 2 males started to go at it, but this was not the usual play. 1 male wouldnt stop it took my husband to pull them apart. 1 male is separated from the group. What I want to know is why this happened?