Our 8mo old puppy seems to have a very short attention span. We take her out on a leash to “potty” and if there is anything or anybody else around, she is distracted and does nothing. It can be a bird, a car, a person, or just sniffing in the wind. She has learned to obey the “sit” and “shake” (offers a paw) commands. Has not learned “down” or “stay”. We think she is “ADHD”. Any suggestions?