I came from enterprise SaaS before this, and on the one hand it's great to be dealing with something tangible. Every time I get the Shopify notification on my phone that I've sold something, it is the greatest feeling that someone has decided to shell out money for something that I created. Of course, the downside is that I have to actually pack and ship something every time that happens... that's the upside of SaaS - build once, sell over and over.
I was already making the treats for my dogs, so I started by getting a designer on 99designs to make the logo and packaging, throwing a Shopify site up and telling people I knew. Thankfully now I'm at the point where I'm starting to manage profitable search ads and I think I'll have profitable Facebook ads soon.
The business is https://coopersdogtreats.com/.