Dollar General review: I was told by the cashier as soon as I entered the store that I couldn't bring my service dog in the store

This happened sunday 1/12/2020 @ 11:30 am. The guy was rude as soon as I walked in he was waiting on a customer and he says to me no dogs are allowed in the store. I said my dog is a service dog. He says for what.?. I said your not allowed to ask me what reason I need a service dog. He said oh yes I can. I can't believe that i've had my dog for 5 years and never had someone be so rude! Especially in front of a customer. I spend alot of money in your store's and can't believe a service dog that is perfectly well behaved is denied entry. I'm very disappointed... Smh