Animal abuse.

Guys I'm a little conflicted on what I should do about my back door neighbors' dog being bullied by these other dogs they have. I hear it screaming and yelping all day. I feel like so powerless because I can't hope over the fence to seperate them. Not only that my mom keeps telling me not to get involved. It angers me so much. I'm so upset i can hear the screams to my room which in the front of the house. You can only imagine the mistreatment it's getting from the other dogs. I can't bare hearing it. I can't stand it. It's like hearing a kid getting beat up. I want to call the cops but I dont have evidence and with my mom yelling at me while getting on a chair to look over the fence my backdoor neighbors would probably spot me recording if I tried.