If you shop at PetSmart you might want to head over to Facebook for their most recent coupons! Once you're a fan of the PetSmart page you'll be able to access a coupon good for $5 off $25+ and one for $10 off $60.
There's a limit of two prints per coupon and it looks like the expiry date is one week after the print date. According to the fine print, these coupons are valid in the US, Canada and Puerto Rico and they cannot be used to purchase gift cards or make charitable donations. Happy shopping, pet lovers!