And they are able to show insight and planning to get what they want...

Once a friend of our dog came visiting, grabbed his favorite stuffy and happily chewed it in the yard. Which our dog clearly resented.

So he cleaned up the yard and hid all other toys in the house. Usually that's our job - he never bothers to look after his toys.

Then he came out with an old tennis ball, pranced around, played with it, like "Dude, this is the BEST toy EVER invented. An it's mine."

His friend dropped the coveted stuffy and came over to investigate... our dog dropped the ball, grabbed the stuffy and hid it in the house.

His friend was left with a slimy, boring ball.

I really can't think of any other explanation - he knew how to get his stuffy, but also anticipated this trick wouldn't work twice. So the cleanup in advance.