They stink, look dirty and cause skin irritations.
Our collars are stink proof, too. Made of medical grade thermo-elastomer, C4 collars are non-porous which makes them waterproof, stain resistant, hypoallergenic, and easily washable. Most Collars stay wet and are like sponges for dirt, grime, and bacteria. Border Collie Dog Collar With Silver Buckle - Medium C4 Collars are ultra-durable and mega-comfortable.