Hi there, my preference would be #8 simply because I prefer the font you've used on this one. I'm not sure the dog and the cross quite captures what I'm looking for. Think the dog is a bit too Looney Tunes style, and the cross (X) is maybe making it look like a "no dogs" sign if you know what I mean? Maybe just a dog face and not a whole head? Great work though, you're obviously very good at what you do,