HELP! We have Frankie, a four year old rescused Redbone Coonhound who has just this year decided to start biting people. He has gotten the postman (not uncommon, I suppose), someone on a bicycle (not every bicycle excites him, so it's totally random), the window washer, and the man who mows the lawn. It will not be long before someone sues us. He is normally sweet, but when the doorbell rings, or a stranger enters the house, he does get into a bit of a frenzy. We have another dog who sometimes begins the process by barking at anything unusual, then Frankie comes to the rescue. First barking, then biting. Any suggestions? He is not the brightest dog, but is willing.