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Hello. Thanks for the question.
If you are able to get him seen and x-ray the leg, that would be ideal. If there is a fracture or dislocation, that won't heal with rest and pain meds. If he is able to bear weight on the leg, even though he's limping, then that rules out a fracture. I just worry when we hear that they won't bear any weight.
If you want to try an over the counter pain med to see if he starts using it, you can use Aspirin. In a typical cat, we give 1/2 of an 81 mg baby aspirin every 2-3 days, as needed.
I hope this helps, let me know if you have any other questions.
If it's fractured, he'll need the fracture stabilized before he'll be able to bear weight. That is done either with surgery, a cast or a splint.
Sounds like a plan. You're very welcome.