Just don't do it. Because then you will see that caring for your pets has become infinitely easier due to an awesome employee discount. You will also learn that you miss having a particular kind of pet. Some of them you will remember why you don't want more. Others you will stare at going why not?
Then you will talk yourself out of things such as fish because oh dear the tank requirements are more than you can feasibly handle. You can talk yourself out of lizards because you really don't want to set up another terrarium.
However, then you will find a betta fish. One that reminds you of death incarnate and you will remember that betta fish are simple keepers. You will also find that you just so happen to have lovely kits on sale clearance right now, and everything else is strangely on sale.
Then you will spend a week talking about this death fish to your roommates until they ask you why you haven't bought it yet. At that point, you will come home with the fishie and spend all night watching the fish become acclimated to proper living conditions.
This is Sithis. Hail the Dread Father everyone. Thought about after the gunk builds up putting in a nerite snail or something for him to help keep the algae and such down, but after watching him go after a few flakes of food like a rabid dog, we are not sure that is a good idea...
Anyway, he is a very small betta right now. Also, black rocks were probably not the best choice as he blends in with them like nuts when he is down there, but the Void cannot reasonably be any color other than pitch black so. (Also known as: The black rocks were on sale.)
Now the kitty kitty hasn't a clue what to think of him. She isn't getting up there, she just stands there staring at him. She stays in the bedroom with me at night and I made sure to get a tank with a hood for him mostly for safety, and also to keep any dust out.
In case you needed any more reason not to work at a pet store. You will also run into the problem with your new cat sleeping on your pillow, your face, and everywhere else you previously thought as yours. She will have this nasty habit of kneading everything when she is happy, and since you work at a pet store and are capable of ensuring an amazingly healthy diet and giving her all of the love she deserves, this will happen a lot. More than likely on you. While you try to sleep. Which means you will wake up every morning before dawn because she wants more pets.
So do not work at a pet store. Your wallet will thank you.
If you happen to anyway, best of luck. Just remember that sweet, sweet discount and laugh like a maniac when you leave the place with a cart full of the highest quality of food and supplies for all of your critters for significantly less than everyone else. If they're going to get your money anyway, you might as well get something out of it.