Instructables

Step 1: Crochet dog harness

Gather materials
    Dog (or cat, or, whatever pet you need to put a leash on)
    Para-cord / Nylon twine (I'd suggest against cotton, or, hemp, because they tend to rot.) 
    Crochet hook 
    Hardware (buckle, clip, clasp, etc.)
Optional (measuring tape, lighter, yarn or embroidery needle)