I am visiting my mom-in-law for couple days in Texas and dog sitter messages me that Poppy has a lump under her ribcage that she did not notice before. Not alarmed at this point, but then she said it is larger than a gold ball and hard; non-fatty. I called and asked if it was a bee sting or bite. She is concerned that it could be part of a toy. I called Animal ER and gave them my cc number - hoping to hear something soon. I vaguely recall reading sudden onset of lump/mass in boxers. Has anyone had this experience or know of sudden onset? Prayers for sweet Poppy who just celebrated her first birthday.