**I worked for Pet Valu the corporation, not a franchise. This review is strictly based on working at a corporate location. **
Pet Valu has an excellent training program. I felt very confident with the knowledge they armed me with for dealing with customers. They had exams that every employee was required to take, as well as seminars that were put on by the different pet food companies.
It can be a lot of hard work. It's not just front end work like a lot of people expect. A lot of it is dealing with delivery; hauling bag after bag of 40lb dog food bags (or cat litter!) onto shelves that are well over your head.
Pet Valu, for an 8 hour shift, gives you one unpaid 30 min break...and that's it. They say that you can have 2 15's...but if you try and take one you're in a lot of trouble. You're constantly on call (no matter what your position is), the district manager (at the time) was not a very nice person (trying to be polite here). That's not just my opinion, it was known chain-wide.
Basically it's a good place to work if you don't mind being used a bit. They do teach you a lot about nutrition, but they work you like a dog and pay you very little for it.
Oh, and corporate sold our store to a franchiser even though they promised they wouldn't...so job security is kind of shaky.