Nintendogs: Labrador and Friends cheats and cheat codes for Nintendo DS

Delete your saved data:
Hold L + R + A + B + X + Y at the Nintendo logo

Unlocking breeds and houses:
Collect the indicated trainer points to unlock new breeds and houses.

2000 pts. - Pug
4000 pts. - German Shepherd Dog
6000 pts. - Desktop
8000 pts. - Shih Tzu
10000 pts. - Boxer
12000 pts. - Seaside
14000 pts. - Beagle
16000 pts. - Shetland Sheepdog
18000 pts. - Outer Space
20000 pts. - Golden Retriever
22000 pts. - Cavalier K.C.Spaniel
25000 pts. - Ranch House 
30000 pts. - Husky
35000 pts. - Yorkshire Terrier
40000 pts. - Northern European
45000 pts. - Dachshund
50000 pts. - Chihuahua

Find Fireman's Hat - Dalmatian
Find Jack Russel book - Jack Russel Terrier

Eating light bulb and bone:
When your teaching new tricks to your dog the light bulb appear your dog head.
You can feed this to your dog by dragging it to its mouth. You can do the same 
with the bone which occasionally appear when trainig your dog.

Before you go on a walk, if you have a lucky collar put it on the dog that
 your gonna walk. Then if you have a clover clock put that on as well. When 
you go out for a walk you get to a present and it is likely you will get 
something really good, like a dimond ring or a golden lead.