The question

We dropped in our golden retriever with a dog boarder. The dog boarder has done boarding for our dog many times over the past six months. So, she knows about our dog's temperament. This time when we came to pick our dog, he got excited and pulled on the boarder. The boarder was not wearing any shoes, was on her property. She fell down due to the dog's pull. She then was able to get up and walk. She also handed over our dog and the transaction needed. A day later she asks my husband and I to pay for medical since she is in paina nd wants to see a doctor. Are we liable?