Dog owners question

I am dog sitting for my 'nephew' Murphy and he is a maniac for the Greenies green bones. I gave him a jumbo one last night and he stayed up all night chewing on this thing like a madman. If we walk past him, he growls at us. If I lay on the couch, he jumps on top of me with the damn bone but I can't touch him.

I let him outback and he buried it only to scratch at my back door until I let him back out again to retrieve it.

What is in the greenies that they like so much?

LOL that's cute....I wish I could have a dog in my apartment! No idea what's in them....doggie nip

I don;t know what it is, but my sister's dog loves them too...You can get them online for cheaper than in the store.