I've been letting my cat, who is a little over a year, out side during the day to have some fun, explore, and cool down since it is very hot inside and we live on the coast of MA. Normally if we see her outside, she'll run away, like she's playing a game. But i found her laying on my porch around 6 pm today and her front right paw was a little swollen. I tried to look at it but she wouldn't really let me. She kept it to herself. When she walked around she wasn't limping, she was putting weight on it, but it seemed like a little less weight than normal, as she was leaning towards the other side when she was sitting. In about a half hour it got progressively worse and it's swollen to double the size. I've laid her down on my bed and she seems very lethargic. She keeps her swollen paw out in front of her face and keeps licking and biting at the side of it. I don't believe she cut it, since I don't see any blood. I'm unsure of whether I should wait and take her to the vet tomorrow or to see if the swelling goes down. I don't know what she did to it, if she got bit or stung, if she sprained or broke it, or if she cut it and it got infected. I know that if she broke or sprained it that the best the vet could do is to give her some pain medicine if she needs it, they can't do much else. I just would like to hear of any other things she could've done to it, or any advice anyone could give. I'd be very appreciative of any help.