If you go sign up for their mailing list, these folks will send you a coupon good for a 5-pound bag of their dog food.
I once posted a deal of this sort and someone protested in comments that they don’t want the email spam that comes along with these offers. I said before and I’ll say again: You should have a dedicated email account specifically for your internet shopping and mailing lists. That way your “regular” inbox doesn’t get cluttered up.
There’s a million free email services out there, so there’s no reason not to just create and designate an account for this purpose. Heck, I have about a billion Gmail invites left; let me know if you want one.