I am always very careful not to over exercise puppies especially during their critical growth periods (particularly the 2 to 9 month period) and up to about 2 years of age.
Always allow them free play (ie not on lead) so that they can stop when they are tired, you can walk them on lead but to begin with just short periods of time, perhaps starting with 10 to 15 minutes - but keep an eye on the puppy if he wants to stop and rest - he has had too much.
There is plenty of evidence suggesting excessive exercise can contribute to developing dysplasia, assuming the dog has the gene and with dysplasia being so common in this breed, there is bound to be a genetic dysplasia link in your puppies line.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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