Some 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 MillanIt's a big mistake when encyclopedias say "loyal" - this dog, this breed has this ability to be loyal, to be a one person dog. I don't agree with that. I think all dogs are honest, all dogs have integrity, all dogs are loyal and they're all capable of loving you. It doesn't come from the breed. It comes from the dog.
Cesar MillanBreed is among the least important things about a dog. It's more important to find a dog with compatible energy and needs that will fit into your lifestyle.
Cesar Millan