wow I didn't realise it was called a 'kong'! This is Lucy's very fave toy! We don't often put treats in it but she loves it anyway. She will make you chase her all around the house and garden, infact I have been chasing her for the last hour and a half and I have had to hide it to get a break or she will sit next to me and poke my leg with her nose! Thank goodness she is now sound asleep on my bed!!!