There are people out there would have just taken Duke to the nearest pound or worse. You've done the best you can and are being compassionate and loving in finding him a good, new home. I have 2 cats and got a new dog when my old girl died in Feb. One cat would not come inside anymore and the other started going on the carpet. I was thinking of giving up Mindy to a new home but stuck w/it and eventually 3 months later, all came around BUT it doesn't always happen that way. I know you'll miss him but a new forever home is in his future.