Absolutely my Rotties fave is the Tennis Ball! As soon as I take it out of the drawer she is ecstatic. I wonder why all Rotties seem to love tennis balls? I have to put it away,though or she will destroy it. I bought her a Kong and it sat in the yard for months,I even put steak in it and she still didn't care about it. Then a friend's Rottie came over and this dog,Dakota went for the Kong and my girl,Hiedi ,got upset and grabbed it away and started chewing on it like it was her FAVORITE toy. Silly girl! Then Dakota left and Hiedi ignored the Kong again. She also loves to chew on large bones and bark at the vacuum cleaner and any sort of teeter totter or merry go round or swings. I guess she thinks those things are not safe.