Kong Extreme

What can I fill my KONG with?

I just bought a "Kong extreme, size XL" today mostly as a boredom buster for my pup during crate training.

my boss suggested filling it with kibble and "closing" the bottom with peanut butter.

What else can i put in there?
I am looking to use it as often as possible (daily?) so nothing too fatty or anything like that....
I know they make special treat "cremes" to put in there, but I'd prefer to use home stuff, as I don't want to pay $8 a can :/

I think frozen peanut butter is your best bet. Peanut butter is pretty healthy, and you can avoid icky things like partially hydrogenated soy oil and high fructose corn syrup by buying a natural formula, which sometimes cost the same as the regular formula! That's what I put in my Kongs.
Those special Kong fillers are expensive by the can and have lots of unhealthy ingredients and preservatives too. So does cheez whiz! It's all oil and salt and nasty chemicals. If you can find a healthier cheese to stuff in there, that would be better for your pup. I bought some pure freeze-dried liver, and I don't think there's anything in the world my dogs like better.
You could pretty much put anything in there though; a dog biscuit, some plain yogurt and freeze it, some meat or animal organs from the grocery store, regular kibble or regular wet food... For lions in zoos in the summertime, I've seen them give them bloodcicles. They put blood in a bucket and freeze it, then pop it out and give it to the kitties.

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