Today when I took Blitz out to go to the bathroom, he jumped up and I guess landed on his foot wrong and yelped a little. When he puts weight on it he whines for a little bit then stops. When I touch or examine it, it doesn't seem to bother him. His limp is very slight. So what should I do now? Take him to the vet? (This all happened about 20 minutes ago) or should I wait and see if it improves or gets worse?