K-9 Designs: Custom Made Durable Martingale Dog Collars, Coats & items, K-9 Designs custom tailors Greyhound & dog friendly everyday safe, secure martingale collars, leashes, dog coats, vests, etc. Other dog products include; Kennel muzzles, dog calls, decals, signs, for Greyhounds, Whippets, Poodles, Labradors, Terriers, Beagle & all breed canines.