Unlockables (US Version):
These are what you unlock with trainer points in the US version of Nintendog: Lab & Friends, new breeds will appear in the kennel, new houses will appear in the interior decorator.

Shetland Sheepdog - 16,000 Trainer Points
Outer Space(Interior Decorator) - 18,000 Trainer Points
Golden Retriever - 20,000 Trainer Points
Beagle - 14,000 Trainer Points
Seaside(Interior Decorator) - 12,000 Trainer Points
Boxer - 10,000 Trainer Points
Shih Tzu - 8,000 Trainer Points
Desktop(Interior Decorator) - 6,000 Trainer Points
German Shepherd Dog - 4,000 Trainer Points
Pug - 2,000 Trainer Points
Jack Russel Terrier - Find the Jack Russel book on a walk
Dalmatian - Find the Fireman's Hat on a walk
Cavalier K.C.Spaniel - 22,000 Trainer Points
Ranch House (Interior Decorator) - 25,000 Trainer Points
Husky - 30,000 Trainer Points
Yorkshire Terrier - 35,000 Trainer Points
Northern European ( house rennovation) - 40,000 Trainer Points
Dachshund (dog) - 45,000 Trainer Points
Chihuahua (dog) - 50,000 Trainer Points

Eating bone and lightbulb:
When training your dog occasionally an outline of a bone will appear on the screen, you can feed this to your dog by dragging it to its mouth, you can do the same with the light bulbs that appear above your dogs head when your teaching them new tricks.

Find out if there is garbage or a present on the floor during a walk:
To find out if garbage or a present is approaching during one of your walks, look at the top screen. There should be the little dog symbol on the path that you drew. If that dog symbol stops and your dog is still walking, this indicates that either garbage or a present is coming up on the floor. If it is a present, tug your dog to a stop and your dog will notice it. It will pick it up and bring it over to you. It is easier to do this when your dog is running.

Get unlockable breeds easier:
Do Bark Mode with a dog in a breed that you don't have.

Example: Do Bark Mode with a Boxer and after you do Bark Mode with that dog, you will be able to buy the Boxer breed at the kennel.

NOTE: This only works the first time with each different version of the game. So you can do this trick one time with Dachshund & Friends, Chihuahua & Friends, and any other version of Nintendogs.