I bought 6 feeder around 650lbs. They were all nice looking calves no issues. Once I brought them home and unloaded them one started limping immediately after coming of the trailer. I am thinking he landed wrong on the cement coming off the trailer. At first he was holding his leg up but after 48 hrs he is putting his weight on it but still limping. I am thinking he sprained it. How long until a sprain is better at what point should I get him to the vet.