About 3 days ago, I noticed my 5 week old Buff Orpington chick limping. I'm not really sure "limp" is the right word for it. My grandma would have described it as a "hitch in her get-along". She will sometimes take a few normal steps in a row, but mostly takes awkward hoppy steps, like she puts the foot down and then immediately yanks it back up. It becomes really pronounced when she's running. She seems to bear weight evenly on both feet when she's standing, and I can't find any sort of injury. She is eating, drinking, and pooping normally, so I've just been keeping an eye on her. It doesn't seem to be getting better or worse, but she doesn't really seem bothered by her gimpy-ness. The day that this started, my brother did tell me that he accidentally left the gate between the two halves of my yard open, and my dog had gotten into the chicken side of the yard and attempted to "play" with them. He said he thought the dog had only chased them a little, but I'm wondering if the chick injured itself in the process of running away. Any ideas or suggestions?