Kassie was the first here to have a limp and swollen wrist. Vet checked her for Lyme Disease first and that's what she had. She was treated with antibiotics and was fine.
Marvin was diagnosed with osteosarcoma and his symptoms came out of the blue. He was fine, no limping or swelling, but one evening, after a nap, came to me panting, holding his front leg up and had a big swollen wrist. The first thing his vet checked for was Lyme disease, he didn't have it so she did and x-ray and saw it.
Ramm (Marvin's littermate), was limping on his front leg last summer, the vet checked him out and said he has arthritis in his elbow.
Limping can be caused by many things so if there's a limp you're concerned about it's better to have it checked out.