Choose from 5 Muttropolis coupons that include promo codes and free shipping deals for May 2021. Our top coupon is a 10% Off coupon code. Save on dog supplies when you use your Muttropolis promo code. Dogs give us so much love and joy, it's only right that we should return the favor. At Muttropolis, you'll find all the collars, toys, treats and beds you need to make your furry friend his happiest. There are also a few things available for kitty, too.