My piggies names are Rick and Morty. Rick is the more adventurous, brave, and pushy type. Meanwhile, morty is the scared, less confident, skittish type. They have been bonded apparently since birth. I notice that morty tends to do a grumble strut whenever Rick gets close, but he will follow rick or go to him for security. They do seem to argue here and there... should I be worried? Is this normal?