Hi, all I have a calf that walked up to another cow (not her mom). The cow hooked it with her horns and she threw it up in the air. It only made a small hole that bled profusely. But an 6 inch by 8-10 inch spot on the top of her back swelled up. This was Sunday afternoon, she wasn't able to get up on her own until Tuesday morning. I have been checking her back twice a day, and it's felt firm where the swelling is, not hot No Puss. Hole has been open, she's inside of a building where rain can't get to her. I gave her Excede and Banimine to help ward off infection Sunday night. Yesterday morning she still seemed fine. Last night I checked her back and it felt squishy like there was trapped liquid, when I pushed on her back Gray stinky liquid came out, not very much. And the Stupid Fly's had gotten into the hole In her back. It was Nasty cleaning that up. We haven't had any flies around due to the weather and Stupidly I didn't think about spraying fly spray on her back to keep the flies out. I'm currently waiting for my vet to open. So can flies make a sore nasty in a 14 hour period? Where did I go wrong? What can I do better next time? I did give her another round of Excede and Banimine last night, I couldn't get ahold of my vet. I tried calling the Emergency number they have.