I hate Chow Chow's. One came into my yard and picked up my little poodle mix and took off with him in his mouth. He survived that time but wasn't so lucky the next, neither was the Chow Chow. Can't say I really hate any other breed. There are those I don't care for. I had a shih Tzu for 14 years, I loved him to death but his name was Rambo and he lived up to it. He would just as soon bite you as not if he didn't want to do something. I wouldn't trust them with small children. I love smushie face dogs I have one a boxer, Love mini-schnauzers, Collies, shetland sheepdogs, border collies and last but definitely not least yorkies. As far as aggressiveness I think pound for pound the smaller breeds win hands down. Now, this is totally my opinion and you know what they say about opinions.