Does anyone know or have a boxer that has this? We have a 5mth old that has swelling in her joints and the vet did a joint tap. The fluid that came out was yellow and was sent out to be cultured they said it can be an infection (which they gave her an antibotic now ) or it could be immune disorder. In the mean time i have to see my baby in pain that wants to play but can't. So does anyone know more about this?