Not a Lab but our JRT mix developed diabetes and needed daily insulin shots. We used one of those testing meters from the drug store and ended up taking the blood sample from his upper lip. I guess he understood what we were doing because he never put up a fight when we rolled up his lip and "popped it" for a sample. We usually did this right before dinner and the funny thing was after a while when we got into a routine e always stood in that particular spot when it was dinner time all most like "hey, I'm waiting" it's dinner time.