My dog had a small lump on the front of his leg,it has been there for a while. He was running and went to jump over the landscaping bricks in front of our porch and missed. He hit the front of his leg. After a few days I noticed the lump which was small,today his leg from the elbow down is huge! I am freaking out here, I have no idea what he did. Yesterday he was his usual crazy self running around like a maniac,not today. Of course it couldn`t happen at a worse time for us(no money). He seems ok but he is protecting it. Any ideas what it is or how to make him feel better would be great.