Well, I wanted to consider that the OP has talked about how she was happy in her relationship with her husband, how she considered him her best friend. So I am thinking about the bigger picture instead of throwing everything away with this one challenge. The communication could have been better from the start that's for sure. Yet, her husband did tell her she could also have a dog too. If he insisted there only be one dog and the OP could not enjoy a dog too then that would be cruel and abusive. But he is not doing that.

I can say that it's actually nice when each has their own dog and each can enjoy their own little fur babies. Less jealousy too.