I bought the small and medium kong for our furbabies. Our oldest loves them BOTH! He has mastered getting the kong treats out by letting it bounce to the floor while on our bed
. That must loosen it up! our youngest only really likes them when they have treats inside or if his big brother is playing with them (he will take it from him
!). He likes the medium one because he can get his nose right in there! The oldest one loves to play with them even when they are empty. He has an obsession with rubbery toys though
!