All my dogs wear their collars at all times unless they're getting washed. Don't want to risk the situation where they get out of the yard because someone left the gate open.
They're all microchipped, but that requires taking them to a vet to get their info. Much better to see the name and phone number embroidered into the collar.
My dogs can come and go inside/out back as they please: I installed an automatic door opener and hooked up motion sensors on either side, down low (dog height). They know to put their nose under the sensor to let themselves in and out (to the back patio).
Whenever another dog ~~sounds the alarm~~ barks, they all spread out and cover every area of the yard with ~~additional alarms~~ extra barking. Letting the whole neighborhood know that ~~the visibility perimeter has been breached~~ we're getting a delivery.