Himalayan yak cheese.
Yes, really. They are dog chews made from Himalayan yak cheese, and they are super hard. Brittany thinks they are super delicious, and it takes her a long time to chew one down. She chewed on one for 2 hours, and it was only half gone.
Apparently according to the package directions, when a chew gets worn down to the last inch, you can make a cheese puff out of it and feed it to your dog. You soak the end in warm water and then microwave it, and it turns into a yak cheese puff.
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I'll consider serving these at my next party - NOT! (Unless it's a dog party.)