I'm sorry that you had a bad time at Petsmart. I agree that the cashier should not have gotten an attitude with you and should have called for someone else to help. But I too have been on her end, at my old job I refused to lift heavy food for people. I have a really bad back and I am not risking throwing my back out and winding up in the hospital because I lifted something I know I couldn't lift. But I always asked the person if they could lift it themselves and if they couldn't, then I would get a coworker to do it.