Okay I have a boer wether who is about 5 years. Just went to the pasture, he's limping on the front right leg. Holds it up when standing. Temp is 99.9, appetite great, eye color dark pink, offered electrolytes. He's the lowest on the totem pole outside so I have no idea what happened and the others don't make it better I'm sure. Nothin in the foot however when I lift his leg, knee pops very bad. What should I do!?