I have three dogs in my family who have all been totally cool, no obvious signs of being unable to recognise me or anything. Dogs rely more on scent, and while your scent may slightly change on T, it's not going to be day and night in comparison. In fact, now that I'm more comfortable in my skin, I feel like my dogs are more comfortable around me, like maybe there was a small barrier between pre-transition me and them. 🙂