If you do give him the kong, make sure its not the puppy kong (it would be pink or blue). They are much softer than the regular kongs and an 11 month would chew through it pretty easily if he is a chewer..I have a large Kong that is for my puppy. I can give that to him but it looks kinda small. Where do you get the treat balls? Petsmart/ petco? Thanks.
Other than that, good luck!