Check ebay for good deals on greenies; we got a bag of 48 for about $16 + shipping!!
I just read the back of the label and it suggests feeding 1-2 greenies a day as a treat. Ranger only gets 1-2 a week so they are more like his "special" treats
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It is true that Greenies help freshen breath; they contain chlorophyll (hence the greenie) which is the breath freshener.