Roughhousing then limping?

Hi folks,

Two large pups that I am sitting, and are a pack, were roughhousing last night and one ended up limping. I told the owner last night and they said that they play hard and to let the pup rest. This morning, pup is still limping and I'm wondering how long should I wait until bringing her into a vet? She is over 50 lbs and not easy to carry out. She did go out and pee, is drinking water, and will not eat her food except for treats. I've had dogs in the past limp and was told by the owner to let them rest, that they'll be alright which proved true. Just wondering if anyone can share experiences.

Thanks! Heather