Garage level
Enter:
BONE, BONE, PAWPRINT, TANK

You will be taken to the Garage Level.

Cafeteria level
Enter:
DOMINO, BONE, KEY, PAW PRINT.

This will unlock the Cafeteria level.

Cruella
At the password entry screen you can enter:
TOY, BONE, BONE, BONE.

This will take you to the final level. If you beat Cruella you will be given two more passwords. Use them to unlock mini-games.

Passwords

Level 2 ... dice - bone - bone - dice - gets you on to the basement level
Level 3 ... dice - bone - key - dog - hets you on inside machinery level
Level 4 ... dice - bone - bone - toy box - gets you on to cafeteria level
Level 5 ... dice - bone - dog - bone - gets you on to baddun brothers
(hint- bark at the brothers until the die you need to kill both to get the key)
Level 6 ... bone - hole - toy box - dice - this will get you on to the shipping room level.
Level 7 ... bone -dice - tank - dog - this will get you on to the garage level.
Level 8 ... bone - dice - dog - toybox - this gets you on to the roof level
Level 9 ... bone - toybox - dice - bone - this gets you on to the machine room level
Level 10 ... dice - tank - bone - dice - gets you on to the generator room
Level 11 ... dice - tank - dice - tank - gets you on to the research room
Level 12 ... dice - tank - dice - paw print - gets you on to the factory floor 2
Level 13 ... dice - tank - paw print - bome - gets you on to freezer level
Level 14 ... dice - tank - pawprint - dice gets you onto parent rescue
Level 15 ... dice - tank - paw print - dog -gets you on to the sewers
Level 16 ... dice -tank -paw print -paw print - gets you on the office
Level 17 ... toy - bone - hole - bone - this gets you on to cruella.
Defeat Cruella ... Passwords for mini games: tank - dice - dice - dice and tank - dice - dice - tank