We see the dog chase her and the way Toto acts around her is exactly how dogs act before they attack people and given that they refuse to put him on a leash they can't claim to know one way or the other. Dorthy says Toto was doing it again that implies that he had destroyed Gulch's flowers before and they refused to put him on a leash. I am just telling that once you have complaints like that any animal control officer would have taken that dog away. Was putting him on a leash really too much to ask?
Why does a dog have the right to destroy people's property, because it is cute???? Under that logic we don't have the right to set up mouse traps in our homes. Sorry but I just don't see how Gultch was in the wrong or deserved to die. Dorthy was just a spoiled brat that should not have had a dog in the first place if she wasn't going to control it.