I was kind of wondering the same thing, one of my dogs is a 3 year old malti-poo and he is a runt only weighing in at like 5-7 lbs. and is non aggressive, my other doggie is a mutt and constantly nips at him and the malti-poo will run away/hide. I always wondered when my snake gets to be like full sized that she would try to kill my dog 0.o so I always keep them separate lol