these balls are to hard for dogs to get in there mouth. i have found that the dogs do not like them at all. they can not chew on them so they just leave them alone.

Pros: none

Cons: they are to hard

My sister's dogs totally loved them. They toss them and chase them and chew forever. My dog also loved them. I highly recommend any Kong products for dogs.
There is no choke factor, not annoying, and very enjoyable.

Pros: These balls last forever

Cons: no cons

our dogs enjoy this for limited amounts of time. great durability, low choke risk if any. can fit under our furniture...

Pros: our dogs enjoy this

Cons: can roll under furniture resulting in dogs making multiple attempts to retrieve

The dogs at the shelter usually like these and they go so far and bounce really high. Some dogs will jump for these which is an extra plus because it tires them out faster. Makes for great games of fetch!

Pros: very bouncy and goes further than tennis balls

Cons: my dog doesn't chase them...

Will keep your dog amused and it is not easy to rip apart. Heavy duty and durable.

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[updated on 2008-02-20 15:19:43]:
My dog enjoyed playing with it outside. She would try to grab it and toss it around. She would lose it under the deck at times and I would have to locate it for her

Pros: Heavy duty - not recommended for inside the house

Cons: none