My 14 month cat got her booster shot at the vet 4 days ago. She went through the sleepy, grumpy cycle like my other cats before her. Now she's past that, but it still hurts her when I touch her rear leg ( where she had the shot ) even if just caressing her. I don't feel any lump. Called the vet, and the technician said it is normal. It's been almost 5 days, and I don't remember any of my other cats symptoms lasting that long after vaccination.