You can get the fuzzy balls at pet stores. We have gotten them at PetSmart, PetCo, as well as private pet stores. They don't always carry them so we buy them when we see them. They are about $10 dollars. Sadly, Clancy destroys them so we are keeping them up most of the time and Ned and Gordie really miss their beloved fuzzy balls!
It seems like Darwin would probably destroy them too. He tends to do that with anything that is stuffed. They are just so cute! They look just like the doodles themselves... :-)
If Darwin has 'lab' jaws, he would destroy them in about 5 minutes. Ned used to destroy them, but now is more careful. Gordie just loves his fuzzy ball so much and I feel so badly that we are restricting access to night time when he is on our bed and Clancy is on the floor.