MY 7 YEAR OLD COCK-A-POO HAS A POUCH OBOUT THE SIZE OF A LEMON ON HER LEFT SIDE NEAR HER STOMACH. SHE IS TOUCHY THERE WHEN I PICK HER UP. DO YOU HAVE ANY IDEA WHAT IT IS? SHE EATS, PLAYS, AND HAS NORMAL KIDNEY AND BOWEL FUNCTION.
I can not tell you what it is with out examing your pet and possible having a biopsy done. I recommend a visit to the vet b/c it could be a tumor. Good luck, vetcare