This sounds strange, but if your critters will let you roll them on their backs you can use a cool/cold wash cloth on their tummies. Max our black and tax doxie get too hot sometimes and that's how we bring his body temp down quickly. Really seems to help.

If our air goes out, we retreat to our basement. It stays 10-15 degrees cooler down there and we could make it until the air is fixed. But (knock on wood) we haven't had any problems lately.

Take care!