I feel like I want to say something about this... but not necessarily something negative about your husband in particular. I have noticed myself acting this way, blowing up at my wife/kids over the smallest little things. Just recently have I found out that I have issues with cycling moods, and quite possibly bipolar. So I like to think, and hoping it is, that these anger outbursts are attributed to that.

Since I have found out that I am having issues with my mental health my wife and I have began communicating more. This has helped us tremendously, I let her know when I am starting to fall that way she can brace herself for the depression and possible anger fits that usually accompany it. Same for when I go up (which she usually catches on to those without me having to say anything).

Also, like PT52 said, I am sure there is something that is triggering your husband's anger fits. Might be good to sit down and just talk.

But, all in all he does not have the right to take his anger out on you (or the dog for that fact).