Equations That Changed the World Eco Martingale Collar Size:Medium Perfect for all your journey

Perfect for all your journey essentials

or pick some up yourself to document your loftiest of ideas

Decorate your space with an earth colored and slate blue art print

or muse on space flight in this Aerospace & Rocketry A5 Hardcover Notebook

earthy aroma of humus and pine

Equations That Changed the World Eco Martingale Collar Size:Medium Perfect for all your journeyThis math inspired collar is great for accessorizing your favorite fuzzy friend while you work on your problem sets. Martingale collars are what you need if your dog's head is smaller than its neck like a greyhound or a whippet, any dog prone to slipping their collar, or dogs with delicate tracheas and necks like chihuahuas and pomeranians. Our Martingale collars are available in three sizes, adjustable, and built with rPET webbing (made from recycled