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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years and I'd like to help with your question.
So, puppies at that age have so many growth plates in their leg.... Each bone on each end has a growth plate which is the focal point when the bone is growing from. Trauma to growth plates can cause small fractures or pain and really effect the way the leg develops. He really needs some xrays to know how serious this is and what to do from here. If it is possible to get him to a veterinarian today for xrays I would do that. If not, then confine him as much as possible so he doesn't traumatize that leg further and get him to a veterinarian for xrays tomorrow.
I hope that helps, but if you have more questions please let me know.