Well, my bull terrier never fetches. He is, in all honesty, the dog with less than one brain cell. But what can you do? Before I got my bully, we had a lab. He used to play frisbee...the higher, the better. He just went nuts. Then one day, he landed wrong on his leg. And stuck to balls after that...my dad found that he liked footballs, though, so we bought him one...took a bit of air out of it, and used that when he got to be 14 years old.

As for lacrosse balls, I play goalie in lacrosse for a boy's team (have been since I was young). They're inexpensive, pretty much indestructible, and hurt if they hit something without a lot of padding. But they bounce really well, and are available in different colours.