I'd definitely say for sure that animals can pick up on vibes when tripping, one day there was a changa session with 10 other people, most of them not taking as much as me, and I spent a long time purging and going into intense trances. For the rest of the whole night a friend's dog who's normally pretty shy just curled up in my lap very contently, totally relaxed and at peace, and I could feel a very certain peaceful energy from her just as she could from me.

Will never forget breaking out and looking up at the leaves of the trees above me in the twilight