Kong Wobbler

Introducing the Kong Wobbler – the ultimate interactive toy for your furry friend! Designed to keep your dog mentally stimulated and physically active, the Kong Wobbler combines playtime with mealtime, making it perfect for dogs of all sizes and ages. With its unpredictable wobbling motion, this durable toy dispenses treats or kibble as your pup nudges, paws, and rolls it around, providing hours of entertainment and rewarding play. Say goodbye to boredom and prevent your dog from eating too fast. 

I suggest using the Kong wobbler to feed meals, especially before going to work. 
it’s large enough to fit a meals worth of kibble and if your dog cracks the code quickly I suggest putting some bottle caps or similar inside to block the exit partially and add some difficulty