You need to qualify for two promotions in order to get it free, the $10 off Pet Profile promotion, and the 40% Off First S&S Coupon.
Create your Pet Profile/add your pet, and if applicable you will see the $10 off promotion on a banner: https://www.amazon.com/yourpets?_..._profiles
Bacon Flavor [amazon.com]
- If you are eligible for the 40% Off Coupon it will appear under the item price
Also available for 0.79 after both promotions Bacon & Beef [amazon.com]
& Bacon & Cheese [amazon.com]
There are many other treats that would be free as well if you qualify for both coupons, here's a good example: Blue Dog Bakery Natural Dog Treats 20oz (6 Boxes) [amazon.com]