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Hi there. I am Dr. Christensen. Sorry to hear that Kirby is now limping. My advice would be to have Kirby seen by a veterinarian. If he is limping, there is some amount of pain that is causing it. Even if it has nothing to do with the lump, I think it is worthwhile to have him evaluated to try to determine what is causing the limp and to get him some treatment to ensure that Kirby is comfortable.
Do you have any further questions?