I did a search and didn't see it posted...
Ibotta (a cash back app) is offering 15% cash back on any in-store Petsmart purchase. I have used this offer multiple times. Offer expires 04/02/18. Must be submitted within 1 week of purchase.
All you have to do it take a picture of your receipt and they will process and add the amount to your account. You can cash out at $20 via Paypal or various retail gift cards.
See details here: (this is NOT a referral link)