my 'dales and fox terriers loved the best balls-they're indestructable-one thing-Jack(my god dog) the big 'dale tries to "have an affair" with the largest one-he does get a bit frustrated because he can't pick it up, he rolls it all over the place and gets totally worn out-he has the small size one ,too-they kinda go cathud when you throw them-he'd rather play with the biggg one-we half filled it with water and he adored the sound-outdoors only with the big ones they can dent walls. The clutch ball didn't last too long-plastic was a bit too inviting-it lasted about 6 hours. We had a time with a tether ball-made our own by putting a nice big ball in a pair of panty hose and dragging the ball just in front of the pursuing beastie.Have a great time Owen