We use nylon or leather but not for walking -only for their dog tags as we dont want to put a strain on the neck
We use harness for walking
Nylon collar
I use Lupine step-in harness. They are colorful and tough. Also they will replace them free if damaged or chewed. And they do it, because my dogs have chewed each other's harness and I got replacements immediately-no questions asked! You just send the damaged one back.