Did she feel anything in the paw? Arthitis? I would wait 5 days from the time the limp started again and take him in for x-rays. He will need to be NPO and have bllod work prior to anethesia.
Take a flashlight and magnifying glass and check his toes, feet, webbing for an injury or corns.
This happened to my Polli. She was limping for 5 days, I bought her in and she was fine the day I brought her in. Becasue of all the manipulation with the xrays her limping was a million times worse after i got her back. She continued to limp for almost 6 weeks. Then she got better and every once in a while she limps. Her results were clean.
Good luck, I will keep Coby in my prayers.
NPO= nothing to eat or drink after midnight the night before