There is a popular term used on the Yahoo Training Levels group: "never ever" behaviors. This refers to seemingly impossible behaviors that the trainer thinks will "never ever" be trained. The funny thing is, they almost always end up being achieved!
Fun & Handy Tricks
101 Things to do with a Box: A Good Exercise for an Older, Suspicious, or Previously Trained Dog
This training game is derived from a dolphin research project in which I and others participated: "The creative porpoise: training for novel behavior," published in the Journal of Experimental Analysis of Behavior in 1969. It has become a favorite with dog trainers. It's especially good for "crossover" dogs with a long history of correction-based training, since it encourages mental and physical flexibility and gives the dog courage to try something on its own.
Editor’s note: You may have heard of search and rescue dogs that find people, but there are search and rescue dogs that find pets, too!
Rabbits are furry and lovable, of course; quirky and silly, sometimes; full of energy and mischief, undoubtedly; but trainable? You bet! You're probably training your rabbit without even realizing it. Is he litter-box trained? Does he come to see you when you go to his cage? Then you've already taken your first steps.
This is a fun exercise that is handier than it seems at first. You'll set up two targets at a distance, and teach your dog to go to either target—left or right—on cue. Later, you will set up similar exercises to bring more general meaning to the cues "left" or "right."
A dog that understands "left" and "right" has a terrific skill for many competition venues including agility, herding, mushing, water dog, and retrieving. This understanding would also be handy walking on trails—and service dog owners could think of a dozen or more applications for "left" and "right."