I have a 9 year old Chihuahua she got stepped on by a bigger dog by accident as they were playing she let out a yelp and then seemed fine. A few days later we let her out and she was running through the field and now she is limping on her left front let and tilting her head a little and holding her head down. She sometimes lets out a yelp and cries when she moves. I took her to the vet they didnt do xrays but he said he didnt feel anything broke. I dont know what to do!