Alright. You've been together for quite a while, so that means that you've got along for quite a while. But then, your husband suddenly becomes snappy, and I'm guessing that's because of a personal issue he's bottling up inside him.
You should try and move out of his way for a while. Avoid getting into arguments. Reduce any socialization with him. This, should make him think about what he has done to you. And when he looks back at his actions and words, he will regret them. I know this sounds a bit mean, but it's proven to work.
After a few weeks, talk to him about the issue (try to show some empathy and sympathy). If he doesn't want to talk about it, persuade him to in a soft tone of voice. Schedule a meeting with a mental health professional, so they can get involved in the helping process and apply some sort of mental therapy.
You should be up to a stage, where you know more about what has happened to him and why he's being so rude. Maintain regular visits to the psychologist for him, so they can effectively apply therapies such as CBT. Then, try and resolve the relationship issue between you and him. Talk about it.
About the dog issue though...
Discourage him, by any means (strict or using emotions). Teach him more effective and less cruel ways to punish a dog.
Because, his constant beatings will grow into a habit. And you don't want your child to be treated in such a harsh manner, right?
I hate to tell you this, but if the problem persists, it's no use trying to stay with him. Get a job, and promptly divorce with him. Don't stay with him. You've had your good moments together in life, but now that he's changed, all you're going to have with him is argument and conflict. I'm sorry for advising you to do this. It will probably be very hard for you to take this sort of advice.
Anyways, hope I helped,
Pyschologistry
