swollen legs on puppy when born, now 4 wks no answer help

we had a litter of rottie pups 4 wks ago, 2 boys one of them his legs and feet were swollen from birth, at 4 days old took them to the vet for tails and dewclaws and she had little info for us and couldnt tell us what it was.  they are now 4 wks old and he is doing great but legs still swollen, he has been the bigger and stronger out of the two since birth, 1st to walk run eat ect.  any sugg, we have heard lymphoma but he seeems so healthy? anything else? what should we do no vets around here have any advise for us except see what happens.

[Thomas Dock, CVJ, Vet. Technician]

Hi...wow, what an interesting case.   I think our doctors in the Ask A Vet forum would love to hear about this.   When you get a chance, cross post your question in either the general health forum or the pediatrics forum within the Ask a Vet Expert section.  Also, any pictures you might have would be helpful.  I am sure that among our 30+ veterinarians, someone can provide a good answer for you.