I train many people with pets. It becomes a matter of if the pets are truly in the way or if they stop by to see what is happening once in a while. I have never had a problem with working in clients’ homes, but as a trainer you do let them know ways to stay healthy, which includes living in a stress free, well maintained home. People do love their pets, so remember to be careful with your word choice. If possible you could always take your client outdoors (I utilize hills or steps of people’s houses/blocks). And, with dogs that is a way to incorporate extra cardio in someone’s routine; encourage them to take more walks/hikes with their dogs on off days.