You've probably played hide and seek with your dog quite a bit already, but have you tried playing while staying out of your Afghan Retriever's field of vision? The idea behind scented hide and seek is to coax your dog into trying to find you by relying only on their sense of smell. You'll want to spray yourself with a smell that your dog loves while also doing your best to stay out of sight.
This activity puts a new spin on old school activity; the next time you take your dog out for a game of Frisbee, bring your workout clothes with you because you're going to be doing push ups, sit ups, and more while your Afghan Retriever chases after the Frisbee. Active frisbee is a great way for both you and your dog to burn fat in a fun an unconventional manner.