I suggest you have a contract with the business. As for price, figure out how long it would take to make one and remember the cost of thread, electricity and wear and tear on your machine. Did the owner offer any idea of how much they would be willing to pay? The business owner should have an idea of how much they can pay for the product, I am assuming they will be using these on dogs that they groomed and will be in the price of grooming. Will the business also be selling these? This could be lucrative for you, if you could sell them some fancier items for retail in the front. If you are interested in making other pet items, that is. Just remember to treat it as a business transaction because that is what it is. I'm sure others will give better specifics, that have way more experience than me.