Sure... they'll hold up the truck and THEN they will all want the EXACT SAME BALL and leave the others .
Perry, Finley, and Duncan have multiple tennis balls out on the porch - 2 that look alike (but one is a Kong ball and the other a regular tennis ball) and a new pack that I bought - pink, orange, blue, yellow. I've only taken out the pink and orange for now. If the pink and orange are not available, then the yellow Kong is the only one worth playing with (they both bounce fine). If the pink and orange are out, then the pink is the only one they want... if I put that away, the orange is acceptable, and if that's gone then the yellow Kong - all the rest get ignored and you have 2-3 dogs chasing the ONE ball (even if you throw 2-3 so they all can have one).