So sorry to hear your GSD has HD, my 5yo GSD girl has HD also, but not to the point where she hurts herself all the time and screams in pain.
If your GSDs HD is extreme, then be guided by your vet, if you are not happy with your vets management then seek a second opinion. In terms of managing HD, you could put him on a good quality joint medication such as Glyde for dogs or glucosamine, eliminate any high impact exercises such as jumping and sprinting with sudden stops and if possible encourage him to swim as this helps with getting good exercise with minimal impact on joints.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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