To me dogs are not the students, not the ones that need training. To me a dog is a teacher of life, who teaches us the principles of the most important moral values; honesty, integrity, loyalty, trust, respect and love.
Cesar MillanSome dogs could play fetch all day long, while others have absolutely no interest in chasing a ball. Some might love "find the treat" type puzzle toys and others may completely ignore them. The important things are that your dog finds the toy interesting without becoming obsessed over it, and that it is size and safety appropriate for your dog. A Chihuahua is probably not going to be a good match to a Kong as big as she is, and you wouldn't want to risk having your Malamute swallow one of those smaller size tennis balls.
Cesar MillanLet your dog teach you how to get the most out of life! If we could all be more like our dogs when it comes to living in the moment, being honest and authentic, and learning how to not hold grudges, the entire planet would be a much better place.
Cesar Millan