It was aspirated then drained, and the hole that the needle made is big enough for the soaking to help draw out the pus. It's not big enough that I can flush it, but I think I might have a finer point syringe I can use than what the vet gave me, if I can find it. He's pretty angry these days, he thinks every time I hold him he's going to either get meds or get put in a bowl of salty water... I do hold him otherwise of course, I think he's a pessimist lol He's definitely doing better already, he couldn't move that leg at all when I took him to the vet.