Thanks for the share biophase,
Something similar here (maybe this was one you looked at?)
https://barkbox.com/
$17 per month free shipping plus 10% to a charity. As mentioned previously its going to around a $10 margin on each box max.
These subscription businesses are all over the place at the moment, dollar shave club, Foodzie, Birchbox etc
Marketing + getting the word out is the real challenge with these subscription services - Dollar shave club did that excellent viral video - but once the word is out and if the service offers real value the revenue model can be lucrative. Its just getting enough people signed up to begin with then retaining the subscriber levels. Eventually if you could get into the 1000's you can use fulfillment services and only have to be involved a few hours a week although there's a lot of work required to get there!!!