I guess it depends on what you mean by a run. I take Keepers running most morning, meaning I put on his leash and we jog for a half an hour. I wouldn't do this with Boo because she's only 11 months. That being said Boo runs all the time in the house playing with Keepers or chasing balls. A little running here and there is fine, but long exercise runs should probably not be done until at least a year/18 months.
All the impact on the joints caused by running can interfere with a puppy's growth and cause injury on unstable joints.
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Andrea & Keepers (and Boo)
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