I was told when Buddy was only 3 to teach him sign language in case he went deaf in old age. Every command and communication became associated with a sign, so when Buddy did lose his hearing we could still communicate with him.
The most important sign we taught him was "good dog", which was simply a thumbs up. It meant so much to me that I could always tell Buddy he was good, and see his tail wag in response.
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