I think it is better to realize now, before you take in a foster, what will work with your pets and what wont. It looks a lot worse to take a foster in and then take it right back to the shelter because of incompatablilty issues. I admire your maturity in keeping your pets first and foremost in your thoughts.

Don't worry, a foster will most assuredly come your way as there are lots of pups in need of homes!