Predictability is what kills a toy. A round ball rolls where a dog expects it to, and within a week the game is solved and the ball is under the sofa. Five flat sides change that completely, because this tube tips, stalls and lurches off at angles nobody can anticipate, the dog chasing it included. That small piece of chaos is the whole reason it keeps getting picked up again.

The pentagonal body is moulded natural rubber, so it takes chewing without going brittle and bounces with the dull, unpredictable hop that only rubber gives. Through the middle runs a hollow core you can pack with paste, wet food or soft treats, which turns the same object into a slow licking session once the chasing has worn off. Two very different activities from one toy, and it washes out under a tap.

• Natural rubber, durable enough for medium chewers
• Five-sided shape rolls and bounces unpredictably
• Hollow core takes pastes, spreads and soft treats
• Works as a chase toy and a lick toy in turn
• Rinses clean between fills
• 180g

On noise and flooring: an unpredictable roller is a hard-floor toy that will find the skirting boards, the kitchen units and eventually the gap under the sofa. It is at its best on carpet or outdoors. And like any rubber toy it is rated for medium chewers, so inspect it regularly and bin it once it splits.

Who it's for: Clever, easily bored dogs who solve an ordinary ball in a day, and owners who want chase play and licking enrichment out of a single toy.