My kitten got his bosters and started the fiv shots on monday. They told me his leg would be tender because of the shots. So on monday he didn't really move because he was tired and sore and then tuesday day he was just fine, then tuesday night it started swelling, and today its still swollen. I don't know if maybe he hurt himself in the bathroom when i wasen't around or some where else. Anyone know if it could still be the shots still or possibly something else?