My boys LOVE bully sticks! Max can chew it for hours but doesn't really get anywhere because he eats it lengthwise
Cooper uses it more as an obnoxious tool to get Max annoyed when playing keep away. Either way, it keeps them entertained for long periods of time.
Just make sure it doesn't get too small for Lulu and throw it away at the appropriate time. Also, when mine are done chewing, I don't leave them out in the open. I take them and put them in zip lock bags so they stay fresh.