For dogs, sniffing is an excellent exercise in mental stimulation, which is why snuffle mats are a popular brain game.

If you look up puzzles for dogs, there is a variety to choose from. Buttons, small doors, sliding contraptions, wobblers, and DIY games are all great ways to keep your pup's mind sharp.

Rat Terriers are highly energetic and intelligent dogs that require regular mental stimulation to ward off boredom and keep ...