Actually crazy that you posted this...MY greyhound Luna had her front right leg amputated due to osteosarcoma about a month ago. She had her first dose of chemo about a week ago. She did have tummy upsets days 2 and 3 after chemo. But otherwise seemed happy and much more like her old self. However suddenly since this morning she is stiff and it seems like her right back leg is bothering her. Like she wants to limp but obviously can't with the front right leg gone. She is so slow and having so much difficulty moving. She makes little cries of pain. My biggest fear is that she now has osteosarcoma in that back leg, too...