The petsmart you may work at might be better than most.
The petsmart here where i live is so horrible syn.
I went in to buy some crickets and took a look at the reptiles and there sat a geko away from the group of the other gekos half submerged in the water,eyes shut.
I asked the cashier to have some one check up on him and she said sure.
Two days later i came back and there was the geko still in the same postion it was in before, eyes shut.
Obviously he was never checked on and was, im assuming, dead.
Also a lady came into the store i worked at asking about how to keep lettuce longer (i work in produce) because her beadred dragon cant eat alot and shes sick because of mbd.
Turns out she works for petsmart and her boss was going to let the dragon die and refused to pay for the medicine, ect, ect to help the dragon get well so the lady took her in.
I guess what Im trying to say is I dont think you would be able to take seeing all the poor animals and how theirt treated,i know i couldn't, but maybe its a different story with your store. I know the one here is horrible.