What the purpose to use dog collar safety strap?

What is the speciality of dog collar safety strap?

It is a safety cord of harness which is hang on dog's neck. Whe a car driver is driving a car then if a dog is walking on the road they can be easily identified from far. It is like a dog leashes. Are you looking for dog collar safety strap ?

If dog needed really safety collars?

Yes, it is safety reason they can hang it on neck for your pet dog safety.