I think that it really depends on the situation. When my daughter was considering adoption for her unborn son, anyone who had pets or would not give up their pets was absolutley out of the question because of severe family allergies. On the other hand, there are expectant parents who want families with pets. Your agency should be open to all situations and clearly communicate requirements. If you do not want to give up your pets, then that should be communicated to expectant parents.
Good luck! (It is my husband who has life threatening animal allergies and I am a kitty cat lover
.)
Happy G'Ma