Inmates in a Missouri prison taught a deaf dog sign language then asked the deaf school to take in the homeless pooch. Brilliant! Considering Dad can't get his teeth fixed, I doubt the Texas Dept of Criminal Justice would spend money on a program like that but it's worth asking. Imagine if Dad and other deaf inmates did the teaching. Now THAT would be synergetic.
Read the article: http://mnn.com/node/87811
Our dog Paquita isn't deaf, but she knows 15 different signs. The irony is that she's getting cataracts. Luckily she knows the signs as voice commands, too, and her hearing is still excellent.