Unlock Welsh Corgi  -  Collect 2000 Owner Points

Unlock Shetland  -  Sheepdog Collect 8000 Owner Points

Unlock Pinscher  -  Collect 14000 Owner Points

Unlock Japanese Style House (from Shiba Pack)  -  20000 Owner Points

Unlock Toy Poodle  -  25000 Owner Points

Balloon:  Get 300 owner points.

Jump Rope:  Get 300 owner points.

Windup Toy:  Get 10,000 owner points.

Natural Dog Food Bag:  Get 10,000 owner points.

Pull Rope:  Get 300 owner points.

Reset data:  Hold L + R + A + B + X + Y at the Nintendo logo to delete your saved data.

Miniature Schnauzer:  Get 14,000 owner points.

Pinscher:  Get 2,000 owner points. Get 14,000 owner points in the Japanese version of the game.

Pembroke Welsh Corgi:  Get 20,000 owner points. Get 2,000 owner points in the Japanese version of the game.

Pug:  Get 35,000 owner points. Get 4,000 owner points in the Japanese version of the game.

Schnauzer:  Get 14,000 owner points. Get 10,000 owner points in the Japanese version of the game.

Shetland Sheepdog:  Get 8,000 owner points in the Japanese version of the game.

Siberian Husky:  Get 4,000 owner points.

Walk without waiting 30 minutes!  -  To do this trick, make sure you have an Accessory on you. Select which dog you want to walk with. While planning the route for the dog, go through as many[?] blocks as possible. Once you have done that, make your way to the park, then back to your house. When your dog starts the walk, when it gets to the park change the accessory it's wearing into something else. After the game finishes saving, turn off your Nintendo DS. When you reboot you will notice that you have obtained all the items you did in the walk, and you can walk again with the same dog without the wait. Do this for present abuse!

Dog or present?  -  When walking your dog, if he/she comes upon a ? mark, he/she will bark once, or twice. Most of the time, one bark means a present, two barks means another dog.

Easy way to find hidden presents  -  When going on a walk, watch the top screen. When the dog icon stops moving, there is a hidden present coming up shortly. Be cautious, however, as this is also true when garbage is coming up, or your pup simply stops by itself.

Get unlockable breeds easier  -  Do Bark Mode with a dog in a breed that you don't have.
Example: Do Bark Mode with a Shih Tzu and after you do Bark Mode with that dog, you will be able to buy the Shih Tzu 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 Labrador & Friends, Dachshund & Friends, and any other version of Nintendogs.

Linking:  When linking copies of Nintendogs to unlock new breeds, keep in mind two things. You can only link with another Nintendo DS system once (and unlock a new breed). The breed unlocked corresponds with your partner's current pet, and it must be a breed that you do not have in order for it to be unlocked.

RC helicopter:  Go on a walk and you may find an RC helicopter as one of the question marks. Hold A to take off, the D-Pad to maneuver, and L to change the camera view. Note: They can be sold for $200.

Agility training:  Go to the gymnasium and train your dog on the agility course. It changes with each contest you win.

Disc contest:  Get a Boxer if you want speed. Get a German Shepherd if you want it to jump high.

Blue circles on the map:  While on walks, blue circles represent places to go to the bathroom.

Longer walks:  Mark out the path on your map, ending it at the house. If your last few steps ends at the house, wait 25 minutes, then your dog can go slighter further on the next walk. Note: Make sure to water your dog after each walk.

Different colored Dogs:  While at the pound, pick a breed. You will have three choices for the dog's coloring *light, medium, and dark). If you do not see the color you like, tap "Back", then tap on the breed again until the color and/or gender that you want with the dog appears. It may take some time to actually get what you want.

Hand stand:  Teach your dog to lie down and beg. While lying down, tell it to beg and your dog should do a handstand.

Flip from back:  Teach your dog roll over and jump. Tell it to roll over then quickly have it jump. It should flip forward onto its legs, with something that resembles a Kung Fu-style move.
 
Getting money:  Go on a lot of walks, getting as many question marks as you can along the way. Then, go to the second hand store and sell all the items you do not want or your dog(s) do not like. Some items are less then a dollar, but the amount adds up if you keep doing this.

Losing contests:  In certain classes of contests, if you get below a certain score you will drop a class.

Walking your dog:  When walking your dog and it seems edgy, give the leash a little tug towards the way it is walking. The dog will start running. Also, if you want you can give it a tug while running upwards, it will do a jump.

Easy Trainer Points  -  Go to the screen where you can brush your dog. Take the brush and put it on him. Leave it there for a few hours. As long as the brush is on him, you get trainer points for every 1 minute. Leave on overnight and you will have a ton of Trainer Points and most likely a new dog at the kennel!

Determining "?" box content - When you find a "?" box during a walk, if you dog barks once it is a present; if it barks twice, it is another dog. Additionally, if you find a present wait until the dog runs off the screen. If it turns white, it will be a trainer. If it does not, it is a present.

Finding items - While walking on the sidewalk, tap the floor and your dog will look and sometimes find an item. Also while walking your dog, there will be a question mark on almost every walk that is not illustrated on the map. When you see it on the touch screen take your dogs leash and drag your dog to the present. It will be a present or garbage that your dog should not eat.

More trick and competition opportunities - Your dog can only learn a certain amount of tricks a day, while the same goes for competitions. To get additional chances at tricks and competitions, change the system date to to the previous day and set the time to 23:59. Exit the menu and turn off the DS. Immediately turn it back on and load the game. You will see the previous day and time shown. After one minute it will be an entire new day, allowing more tricks to be taught and competitions to be won. This can earn you more money if you win the competition. When you want to follow the normal order of things, just set the date and time back to the correct values.

Raising more than three dogs - The Dog Hotel will hold up to five dogs at a time. The three that you can raise do not count with the five, making it possible to raise as many as eight dogs.

Secret shedding records - If you walk your dog a lot, you will eventually find an item called "Secret Shedding Record". This item plays strange music when you activate it from the music icon in your supplies menu. There are four records in the game; these are extremely rare.

Trainer information - The name registered in your Nintendo DS will appear as the owner's name, as well as your date of birth. You can change your picture to their choices of avatar pictures; there are eight choices all together.

Training locations - Each competition should be trained at a different place (disc competition at the park, agility at the gymnasium, and obedience at an empty park or house).

Agility training - Go to the gymnasium and train your dog on the agility course; it will change with each competition won.

Obedience training - Have a dog do a trick repeatedly until a message appears. Name the trick, then the dog will do the trick every so often. Keep teaching it the trick until it does it the first time you call it. Note: The dog can only do so much training in one day. For more training, wait until the next day. Additionally, when teaching your dog to fetch, every time your dog brings back the item from tapping the screen, pet it until the sparkles appear. Then, take the item and throw it over again. After doing this awhile, your dog will bring back the item automatically, thus making the contests easier.

Competition courses - There are five courses for each competition: beginners, open, expert, master, and championship.

Avoid losing ranking - Before entering competitions, save the game. If you do badly, turn the game off before the competition ends to avoid ranking loss. Note: Whenever this is done, the leader's score will change.

Deleting tricks - On the camera view of your dogs, tap the question mark under the dog's picture. It will bring up a screen with the dog's information on it, such as name, age, gender, etc. At the bottom is a button to go to the "Trick List". Tap on a trick, and tap "OK" for the dog to forget that trick. If you delete the trick by accident, you can re-teach the dog the same trick, and name it the same.

Longer walks - Mark out the path on your map, ending it at the house. If your last few steps ends at the house, wait 25 minutes, then your dog can go slighter further on the next walk. Note: Make sure to give your dog water after each walk.

Question marks on the map - While marking out where you want to go on the map, try to get as many question marks as you can along the way. There are either other dogs or gifts that your dog will find with each question mark.

Beautiful dog coats - Give your dog a bath when the dog's information page for coat reads "Clean". This will also make the dog like you more.

Other treats - When a bone or light bulb appears when you are training your dog, use the stylus to drag it over its mouth and your dog will eat it. While interacting with your dog at home, if you give it enough love by petting and scratching it, a golden dog bone of light will appear. You can give it to your dog as a bonus treat.

Stand up - Once your dog has learned to beg, lift its paw up, and make it stand on its hind legs. It will stand and you will be able to teach it how so it is remembered.

Walk on two legs - First, make your dog stand on its hind legs. Put the stylus on his or her leg and drag up. He or she should now be standing. Note: Teach your dog that trick so it is remembered. Then, pull its paw to the area that the training icon is located. It should now be walking on its hind legs.

Wave paw - Get your dog to sit and hold an ear back. The dog will wave its paw. Do it three or four times to get the trick.

Break dance - Teach your dog to spin and roll over. Make it roll over, then while it is on its back, tell it to spin. Your dog should spin around on his or her back, almost like it is break dancing.

Rag doll puppy - When your dog is playing with the pull rope, grab the other end and pull up with the stylus. This should make the puppy hang on the other end like a rag doll. Drag the rope around the screen and eventually the dog will fly off.

Throw your dog - When you have the Pull Rope, try to get your dog suspended in the air. When it does, make it turn slowly (or it will fly off), and release the stylus. Your dog should fly away.

Dog hang - Get the pull rope, then take it out. Wait for your dog to bite it. If you quickly slide the rope up while it is biting, one of two things will happen. It will either let go, or the camera will go above the dog, and it is hanging on the rope. To stop, let go of the rope or swing the rope around until the dog loses its grip and goes flying.

Pikmin reference - In the pet supply shop, there is a Pikmin enemy on the shelf on the top screen.