We have a 14 year old 10" Best Ball. I bought it for Spyder who was a 6mo old cattledog in 1998. She has played with it through all weather conditions. When I tried to replace it with a new one, she wouldn't let me throw it out. Now our newest addition, an ACD mix, herds it. I'm buying her a medium size for variety.
My 55 lb. brindle pitbull mix (Meatball) pushes the 10" red "bawbaw" around her huge yard and keeps it animated for at least 1/2 hour! Self perpetuating ball. But that's her. We had two, lost'em both in the canal so am back for more. Her FAV! She get's into an obsessive mode and wears herself out. SO FUN TO WATCH! She get's it to the bottom of an outdoor staircase and pushes it up each stair till she reaches her goal and sends it across the lawn again. Best toy for this sweety, EVER. Love my "Meatball" and her "Big, Red, BawBaw"!.