That's awesome that you want to help and adopt a dog. It can definately be a challenge but I think it would be well worth the effort. Dogs rely alot on body language regardless of hearing or not so as long as you use the same hand signals as everyone else, it could work out really well. I heard about a couple who put on a collar with a little film canister attached to it. The canister had a small type of gadget that vibrated everytime they pressed the button on the remote. They used it to get the dog to come. It worked very well and it could be worth a shot if you do decide to adopt a deaf dog. Another couple bought a pager for the dog and attached it to the collar...that worked the same way. Good luck in whatever you decide.