I think you are right. In my opinion any milk is better then none at all and some dogs can be more sensitive then others. I never tried goat milk before, so i'm not sure but i think that it is just as beneficial as any other.
The dog that i wrote about was a german shepheard mix, so it was pretty strong to begin with. My yorkie does great on cow milk, he loves it, but he usually only has a few sips and that's it. I also have a boston terrier and he is obsessed with milk! I have to be careful with him, bc he will take all that he can get, he doesn't know his limits.