Doge Coins best suits the pet shop. Maybe OP can put a logo of Doge coin on the sign board of his shop.

You aren't serious about this, are you? There are less people around who have a dogecoin wallet than a bitcoin wallet and using a lesser known altcoin as the only payment method will turn away potential customers.
Besides OP could have just as well accepted rabbitcoin, catcoin or birdcoin, all of these exist.