Wow! My Sophie IS deaf, this I know for sure. There are times when she acts like she can hear. When my hubby works late and comes in (our bedroom is right at the front door), Sophie knows! She has actually been sleeping and woke up. It was freaking me out, but then I realized she is SMELLING him. He is a printer, so he comes home with ink odors and because her smell is SO acute, she knows he is home. Now, he is changing jobs soon, so we shall see what happens...she has also looked up when we called her (I always talk to her) and she has gone to the door when a noisy car/truck has passed by. But I think they were just coincidences. Because my hubby is a volunteer firefighter and when his pager goes off--he insists on keeping it very loud--she does not react. She has not reacted to thunder, the smoke alarm, barking dogs, etc. We often have to wake her up in the morning even though she does sleep with us...ahh, the life of my pitbull princess.
I agree with Michelle-Riley's problem could be physical. I am glad she is getting another checkup! IMO, she seems to be hearing. That whistling really makes me wonder!!!
Please let us know what happens. I hope everything works out and if she ISN'T deaf, whatever was/is wrong can be fixed, if it is not starting already...and if it was coincidences, Riley will still be happy because she has an owner who loves her no matter what!