Well most soft balls will break if you're playing tug with a dog who chews it. And any durable ball people suggest is probably going to be a solid, hard ball. I use the gappay ones.
Aiden v HausDaka - (HOT) IPO3x2, FH, CGC, TT
Carma - superstar in the making
Tulah v Maringaland- puppy in training!