I saw these in Modern Dog and thought they were pretty cool
Wagging Green
Their saving the earth collection donates a portion of the profits to organizations related to the theme of the collar.
Plus you can get the collar in the style that you choose
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Buckle Dog Collar, Martingale Dog Collar, Teacup/Puppy Collar, Breakaway Cat Collar, 5ft Leash (1”, 3/4” & 1/2” Width) and Step In Harness"