Carmen, I'm in almost the same situation, except that I kicked my AH out after recurring sketchy behavior, his being unemployed, not being reliable & helping out around the house, blah blah blah.
We too have a dog. I would go with your gut on that. My AH has never, no matter how impaired he's been, hurt, neglected or otherwise abused the dog. He always makes sure he has lots of food & water, plays with him, etc. In all honesty, the dog likely prefers AH over me since our son came along-at least AH gives him lots of attention!!
Stay strong. It sucks. It hurts, & it's humiliating to have to walk away/force the addict to leave. But there has to be an end to what you'll put up with from him, or you'll just end up completely losing yourself.
Hugs.