A puzzle board, not a bowl – Sliding bone-shaped covers and a turning centre disc hide the treats underneath. Your dog has to move something to get anywhere.
10 by 10 inches, just over an inch tall – It sits flat on the floor rather than tipping.
Wells under every cover – Paw-print recesses in the base, so a single kibble can't be hooked out from the side.
Washable – Solid moulded plastic, no fabric.
Start easy – Leave the covers half-open the first few goes. A puzzle nobody can solve stops being a puzzle and becomes a chew toy.