What are some cool nintendogs DS cheat codes

there aren't any codes that I know of, but there are some cool cheats. First, you can put a male and female dog together and they will have puppies! But, you can only feed them dry food, natural dog food, and milk. Keep the dogs at home. DEFINETELY keep the female at home at all times. You can take the male, but I wouldn't suggest it. Second, here is how to unlock the dalmatian. When you are at home and your dogs hear a siren, they will howl at it. Make sure the dog you want to take a walk with is wearing red. (Red bow, collar, etc.) Go out and find the fireman's helmet and you will have dalmatian puppies! Third, if your friend has a breed of dog you want, get together on bark mode. When your friend's dog shows up, you will get that breed of puppy! Fourth, get the Lucky Collar and Clover Clock. Make sure your dog is wearing the Lucky Collar and you are using the Clover Clock. Go out on a walk and you may find cooler and rarer items. Here are the rarest items I know of:
Promise Ring
Weird Alien
Bowser Kart
Peach Kart
Stuffed Dog or Stuffed Bear
HOPE THIS HELPED! :O)