I've not gotten that far. I assumed they could from Fieval's imaging being billy the kid at the start of the movie and being with the dog lawman, willie burb his name may have been. But I've not seen the part where he actually appears and if the movie is a dream. & in the part I have seen it seems the dogs chasing Tiger were acting like normal dogs, so I wasn't sure if some dogs are sentient in that universe, but not all, or if they were just to pissed at seeing a cat to talk.
So there are Mice, rats, pigeons, cats, dogs, maybe spiders and roaches who are sentient? Just asking so if I or someone else wants to work on an oc idea they know which species are canon to be sentient.
As for being in new york, maybe the 2nd movie was a dream and didn't happen, maybe this rp is set before they move to the west, or maybe Fievel's family moved back to New York.