They stink, look dirty and cause skin irritations.
Made of medical grade thermo-elastomer, C4 collars are non-porous which makes them waterproof, stain resistant, hypoallergenic, and easily washable. C4 Collars are ultra-durable and mega-comfortable. Not C4.Flora Dog Collar With Silver Buckle - Small Most Collars stay wet and are like sponges for dirt, grime, and bacteria.