MTF speaking...
My ex has a cat that really detested my male scent. She'd literally scrunch up her nose if she was downwind and move to the other side. Wife said that I didn't smell bad, and I did the usual (shower in the morn, deodorant/anti-perspirant, etc).
Now, 6 months into HRT, the cat quickly comes up to me and snuggles. My smell doesn't bother her anymore. I don't think it's because she misses me, but it is what it is. I have noticed my smell is much less...tart? Pungent? Something like that. I know I don't "stink" like I used to during a hot day.