I think so. We were once put off buying a really nice house because of pet smells. It really was disgusting. The family had rabbits in a hutch in the living room, three dogs that had scratched away at the donwstaris internal doors, and they also had cats and a litter of kittens living in the bathroom and bedrooms.
Needless to say, it took them a very long time tio sell the house, it was just so unclean, and I think, unfair on the animals.