Was he ever cat tested prior to being made available for adoption? That's always something I require when I'm considering adopting an adult dog. They MUST be cat tested. Management and training and always making sure your cat has a safe place to escape to that the dog can never go/get to is a good idea. Have your dog cat tested.
The more people I meet and talk to,the more I love my dogs and their intelligence.
Shasta GSD 5/5/10 CGC
"Dax" Thor z vom Weberhaus 3/18/2013
Zena GSD 6/1/03
Riley GSD/BC 1/10/05-2/1/2013