stick with the ones you have got mate,i had a hob from a rescue that you couldnt get near,he bit a hole in my pals ear,we called him b*stard because of it but now he is daft as a bollock,like a puppy.loves to be handeled and a real character,turned him round in about 2 months and it didnt take much,10-15 mins a day playing,hard to belive now that he could ever bite anyone.atb