I told my ex-partner (ex since a few weeks ago) about it maybe 2-3yrs into our relationship. They were getting very interested in kink and bdsm, mostly just conceptually... and i had been deeply repressing a lot of different facets of my sexuality and kinkiness for a while. So I ended up trusting them with telling about it.
They were understanding and caring, but it wasnt their thing and they were a little grossed out i think... I mentioned I had had a handful of encounters with dogs, just helping the male ones out and being licked a bit. It was a little cathartic to be able to finally tell someone, but it was also quite dissapointing and added to my shame. I ended up basically just repressing it again, saying that getting it off my chest had helped me to move on and that I wanted to stop having these longings. Obviously they never fully stopped, and now theyre resurfacing again in a big way...
So now we just broke up recently... But thankfully we ended on good terms, still care about and respect each other a lot, so I trust them completely not to share that very intimate and private information that I made myself very vulnerable with divulging. I think I'm lucky in that sense but can't imagine that's a privilige which would be common, but I don't know....?