Yes!
They are so obsessed we have to have a designated time for fetch with their "special" balls. They get 25 minutes straight every night...I like to think of it as their structured cardio.
Once fetch time is over, the balls go back up high where they can't get to them. There are millions of other toys to play with during the day, and they can play fetch with those (and often do), but there is something special about their balls. I think I spend most of my day fishing toys out from under the sofa!
Fetch time looks a little something like this:
This is towards the end of the fetch session, so they are actually a little slower than normal!