Thank you, Wiley's mom. I appreciate the advice. I will contact our vet tomorrow and get information regarding a derm and Internist.
I looked at Bentley's arm pits and tummy - and he appears to have slight pink-ish tint, but no real "red spots" or brown spots. It is always hard to check the entire body because he is steel/silver and has blue appearing skin on top (due to coloring of his hair - he is not blue).
His ears are a little red again, smell slightly, I will clean them again this evening and put some of the medicine in his ears.
Poor guy.
He does respond to Benadryl. So, you are probably correct. He did twitch at times before the itching issues, which I think is pretty normal in animals. Or, at least, what I have seen with my friend's animals. I just find it alarming and am being overly sensitive to his issues. If he could talk he would say "please stop, mommy - you are embarrassing me ...".
I thought of Cushing's also, but his hair is healthy (other than on the oily side), no biting off of fur - abdomen is flat and healthy, and he is currently running around playing with my fiance's credit card, jumping in the air and running around - happy as a clam. He doesn't seem to have any muscle weakness. I've watched him run and he doesn't ever hesitate or favor one leg over the other.
I will keep you updated. I appreciate the help. I love my Yorkie.
Melissa and Bentley