Cats make good Kill! practice for dogs.

Dogs can be demanding. A friend of mine that I visit often has a dog that will get bored after an hour or two and start putting toys in my hand to try to get me to play, and if I ignore it long enough the dog will push my chair away from the table to get my attention(!).

Dogs are pack animals and expect a leader in the pack. If the human doesn't lead the dog will try to do it. Every time you see a dog dragging a hapless owner by the leash it means that person is a wimp as far as the dog is concerned. If you're going to own a dog learn to be a pack leader!

Lasers can actually help with exercising a dog in a small area. Get a class II (< 1mW) red (not green!) laser and you can twirl the dot around a small yard with the dog chasing 'til it drops. Dogs can be very obsessive over lasers though so make sure it sees you as a strong pack leader so you can definitively end laser sessions.

PS. Dogs fixate on laser dots so I don't like even 5mW lasers. Also, while red lasers are diodes and generally well behaved, greenies are DPSS and often *not* well behaved: a "1 mW" laser may put out 5 mW at startup, and a real cheapie (Chinese) or broken DPSS may put out 30 mW of infrared, enough to damage the dog's (and your) eyes since there's no blink reflex for infrared.