I have a Bordercolly-Jeck Russell mix. My dog creates each Sielzeug am in 10 min anzuknappern or unrecognizable to destroy. The ball is perfect to destroy any possibility of attack, as the ball is the same size as his mouth plays super happy with the ball through the rubber, although a bit heavy and goes down in the water -. The first is unfortunately gehupft in the channel - but jumps well and fits comfortably in your hand. Great toy!