I'm trying to wrap my arms around this. This is one day or a partial day once every three and a half weeks.

If this is your only job, I have no idea how you are surviving. I have never heard of a retail part time job where you go in less than once a week.

What was the most you worked at this job?

It sounds like it is time to look for a new job, as completely hideous a prospect as that is in this economy.

My local pet store always seems to have tons of employees and few customers. I was in a Petco twice in the past few months, and it was even worse. There were no customers except myself in the store. The lone cashier looked like she was going to die of boredom.