2. How do you charge? This is important. Most reps will charge between 3 - 8% commission of your wholesale cost. The reputable reps will ONLY charge on what they sell. If a rep asks for a retainer - RUN, don't walk away. If a rep believes in your line they will do the upfront work to get the appointment and present your product on good faith.
3. What are your retail merchandising capabilities? This is also important. Petco & Petsmart have abysmal execution rates. Basically this means that your product has a 50% or less chance of being displayed properly on the store shelf if you rely on store staff. A good rep will have a "detailing" team that can go out and get your product from the back room and get it to the shelf. Sometimes this service will be included for the commission rate, sometimes it will be charged separately. It usually depends on the $$ size of your line.
Good luck and good selling!
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