Life isn't fair for anyone with this attraction. Welcome to reality. We are hated by the majority. It may not "be cool" to hide it from a significant other your close with but have you considered the possible alternative of people taking your advice, opening up, and it backfiring on them and their new home being a jail cell? Personally I'm glad I'm zoo exclusive. I don't have to worry about keeping secrets in a relationship ever ?
And from what I've saw, even the "happiest" couple out there does this shit. Everyone holds back feelings; Even about trivial stuff that isn't a big deal. Things that could easily be talked through. Unlike this subject, I get where your coming from but the reality is relationships between people are complicated as it is and not guaranteed to last. Imagine having a ex walking around knowing this about you! Adding zoophilia openly to the mix is asking for trouble, 9 times out of 10.
My advice is if your attracted to humans. KEEP IT A SECRET if you also want to be with animals as well. It's not worth the risk having other people know