Toddlers, Pets, and Clicker Training

Some children of eight or nine grasp the principles the moment they are exposed to them, and can go right to work; having no preconceptions they catch on a lot quicker than adults sometimes. But I think three is a bit too young for the insight into cause and effect that clicker training takes. By all means she can click her stuffed animals or pretend animals; but I'd suggest that with the cat and the dog she be allowed to click and give treats, three or four treats per animal, once a day, say. That will be clicker training, as far as she is concerned; she'll understand more about it as she gets older. Meanwhile the dog will incidentally learn to sit and hope for treats from her, and the cat might learn the same.