Obsessed with fetch would be more like it. Rory loves the small Air Dog tennis balls with squeakers, and Lane loves the rubber soccer balls with squeakers. That being said, if we left their balls out all the time, we would NEVER get anything done. They are forever rolling them under the sofa or other furniture that they can't get it out from underneath, so they bark for us to get it for them then repeat. You get the idea. So, we have a nightly ritual of 25 minutes of fetch every night with their "special" balls and the rest of the day they have to settle for fetching with one of their other zillion toys. I'm a mean mom I know. They have realized the "eggs" in egg babies toys are the most like balls and love to toss those under the sofa too.