I also question my boyfriends character if this is how he raised and trained his dog and he clearly finds this behavior acceptable/normal, how would he raise our potential children?
Sorry to go all psychologist on you, but this is a pretty classic example of what people call the Fundamental Attribution Error. The TLDR is that when we observe other people's puzzling behavior, we attribute it to their character or personality. But, when we do equally puzzling things, we give ourselves a break because we understand the whole situation (including what went on inside our own heads).
Definitely not speaking on behalf of all guys, but having been in a relationship with a girl that frequently thought similar things, I will tell you this:
I don't mean for this to sound harsh, but to me, taking one part of a person's personality and spinning it into fast forward and then pondering the thought of using it as a basis for breaking up is pretty immature. People who are looking for serious, meaningful relationships talk openly and honestly with one another about things. If anything, you owe your boyfriend the opportunity to explain what he sees as acceptable dog behavior, and to have an open conversation with you about the future.
I mean, how would you feel if he saw that you left dirty dishes on the kitchen sink, then thought, "Wow, if that's how she treats her kitchen, how is she going to treat our house if we're together someday?!" Pretty shitty, right?