Chuckit Medium Tennis Balls 4Pk.

The four-pack is perfect for keeping a couple outside and a couple inside so fetch never stops. They're sturdy enough that my dog's chewing hasn't wrecked them yet, and the bright color makes them easy to spot in tall grass.

My dog is obsessed with these and they fit perfectly in the classic ball thrower I already had. Only thing is they pick up dirt fast in the yard, but they bounce right back after a rinse. Solid 4 stars.

These hold up way better than the plain tennis balls we used before, and the felt doesn't shred after a few hard games of fetch. Only reason it's not five stars is they're a bit small for my lab's mouth, so he fumbles them sometimes. Still, four balls for the price is a solid deal.