“I hate my boyfriend’s dog”

Honestly…I hate my boyfriend’s dog. We live together and he barely washes the dog and it sheds a shit ton, ¬†stinks and has ringworms. He is not taking care of it. I fucking hate the dog and want it out. I even imagine hurting the dog or letting it out of the house to never see it again.

We have been together for almost 3 years…. I would hate to break up after this but he refuses to get rid of the dog. He used to walk it once a day and she would pee and poop. I went fucking crazy and now he walks it twice. Every day my hatred for this dog grows.. what do I do… I have been picturing abusing the dog and I don’t like having those thoughts, I’m just mad.