Scooby Doo, where are you?

Scooby is doing great.  Most of the time I'm saying "Scooby Doo, where are you?"  He likes to hide!!!  He goes outside with me while I'm working in the yard.  He's pretty good about following but when he gets tired or warm he comes up missing as you can see in the pictures!  He's not afraid of the saw I'm using to cut trees, the big white dog on the ranch, the cats, etc.  He loves the activity center and yard toys.  He's learning 'sit' with clicker training. He weighs 6#.