I find it is necessary to wear an orange vest while in the field training or hunting with my dog. Since they are also so visible to other hunters you and your dog are safe. Your vest holds many important field items, such as your gloves, whistle and water for your dog. It is very important that your dog stays hydrated while in the field. You also must take breaks while in the field so that your dog does not get exhausted. They are absolutely necessary when either training your dog, hunt testing, or actually hunting with your dog. Vests must be worn during hunt testing your dog. They are required by law for hunting in the Fall! It would be very unsafe not to wear a hunting vest while in the field.