Double harnesses H THE HARNESS DOUBLE H HAS BEEN STUDIED TOGETHER WITH SOME EUROPEAN RESCUE ASSOCIATIONS (not Italian), fully aware of the problems related above all to the rescue Greyhounds. You can find other double H harness models in the Greyhounds - Harness section. ATTENTION: For all Nylon and Biothane harnesses, a width of 2.5 cm is used. For double H harnesses for small dogs like Jack Russell, the tape used is 2 cm wide. All double H harnesses are custom made without additional costs. How to proceed: Choose the harness for your dog and indicate the required measures following the design. How to proceed: Choose the harness for your Greyhound and indicate the required measures following the drawing.