Zane has a drain.

[TexasRanger]

A couple days ago Zane and Deputy got into a fight. I checked both dogs over thoroughly, saw no puncture wounds or deep cuts. All I saw where some shallow cuts that we put antiseptic on. Fast forward to today, my parent leave to get their car fixed and I wake up to Zane with a Grapefruit sized lump on his shoulder, I immediately call the vet and make an appointment. Vet thinks it was caused by an insect/sharp stick, since we have a lot of ground vegetation with thorns,prickles and other sharp things. Has anyone dealt with a drain before? He is resting by himself in another room away from the other dogs, has some pain/antibiotic pills and we are going back to the vet on Saturday to have it removed.