I know this is old but i have the EXACT same problem as this person. I tried created new saves, being on different lots, repairing my game, and restarting my computer but nothing seems to work. Its kind of a bummer that I can't interact with strays because that is a main part of the expansion.
This was happening to me as well. Maybe try and change your lot traits to dog hangout, cat hangout or both. I wish you the best of luck solving your issue. Please remember there is always somebody out there to help. Have a great day.
Happy simming
oscar.
