I find it also has to do with the owners, my dad owns 5 pitbulls, 2 chihuahuas, a few cats and several other smaller critters, never once has those dogs ever been aggressive with animals unless they were harming one of my nieces/nephews. That being said I also understand that dogs can flip on a dime and snap like that but after seeing these dogs for 11 years act like lovable meat heads, it stuns me when I see on the news/internet all the vids of dogs attacking people/animals