Please only answer, if you really know what this may be.. Have 9 year old Male Chihuahua. Last Friday night a lump was felt on his side. By Sunday it was much larger. He saw the vet Monday, but the vet wasn't sure what it was. He prescribed Antibiotics and Benadryl. Two days later, it was a little bigger. Took him back for a recheck, vet did insert a needle to see if he could get anything out (a small amount of clear fluid came out) He said to stop the Benadryl and added Metcam. It's gotten even a bit bigger as of today. He was on Antibiotics prior to this for Bronchitis. Otherwise, he is still eating, runs around and even lays on that side. Any knowledge to what this might be?
I posted a couple of pics, were you able to see them?