AWESOME!!! Dogs learn sign so much faster than the spoken work. That and body language are keys. The fun thing with sign is, you can come up with sign that are just for you and your dog. Lots of folks use the thumbs-up sign for "Yes" "Good Dog" we use the surfers thumb and pinkie up, shaking the whole hand- "hang loose" sign for "Good Girl!" That was the first one Katie learned. After that BOOOOM things really took off. She knows close to 30 words and phrases now and she hasn't even been with us a year yet.
My Icee learns with touch signals. Not only is she deaf, but also 90% blind. A rub on the right ear means Good Girl. Rub on the left means pay attention. Light tap on the end of the nose, Stop that. A touch at the end of her rump means sit.
It's been really HARD, but extreemely rewarding to train these 2 girls. When people get to meet Katie out in public, they don't realize she is deaf until I tell them.