Suppose the beloved Fufi gets her paw caught in the dog food dispenser and mangles it (the paw) trying to remove it? Fufi's owner sues you for improper design or insufficient warning in the instructions, or.... (you should have anticipated that Fufi would get her paw caught...after all, she has to eat). You now have a product liability claim. You hire an attorney at $200 to $400 per hour to defend you. You spend $30,000 to $50,000 (and that can be quite low)to defend the claim in mediation, arbitration, or court. If you have no insurance it's out of pocket. Suppose you win? Well, you could get attorney's fees, but you'd still be out for time lost, poor cash flow in the process, and extra expenses like expert witnesses (not always recoverable).....and if Fufi's owners have their assets protected or have no assets, you could get a nice piece of paper from the court (a judgment) that says they owe you a bezillion bucks...now try to collect it!
OR EVEN WORSE....Your dispenser has a small knob, attached by a screw. It is visible and outside the dispenser. Junior, Fufi's human companion who is two years old, plays with the knob and it comes loose. Junior puts knob in mouth, swallows, chokes and dies.......imagine the consequences of that one!
Any product, no matter how simple, if put in the retail marketplace, has a potential for a product liability claim. If it has moving parts or is used by the general public, the odds go way, way up!