The format for a resume really doesn’t matter, except that it allows you to provide as much relevant information about you in the fastest time possible. I.e., don’t waste space with filler material and less relevant stuff.
What you want to do is to tell your story. Whatever format that allows you to tell your story most effectively is what you want. You should find out what kinds of things people working at small animal boutiques do. Is it a sales position? Is it just being a clerk? Will you need to decorate the store?
Think of all the things that would make someone good in that position—being early and opening the store. Staying late to close it. Loving people and being good at interacting with them. Loving rodents, lizards, and tarantulas. Of course, being efficient and knowledgeable.
You resume should show all these things. What did you do as a cashier that really shows your customer service expertise? What shows you like rodents and other critters?
List out all your assets for this position, organize them by importance, and then find a way to tell your story so the most important stuff comes first.
I can’t tell you how many useless resumes I see. They don’t show me what someone can do. They just list things. If you stay away from lists and put even the barest hint of your story in your resume, you will stand out completely.