The Sims 2: Pets Codes -

Sicknesses:
Ramon

Flu

Length: 3 days 
Cure: Flu medicine for three days every day one time. 

Broken leg

Length: 5 days 
Cure: Put bandage on and let him rest a lot. 

Item swallowed

Length: Unknown; as long as it takes for you to extract it. 
Cure: Buy an Extractor and extract the item from the pet's belly. 

Ugly

Length: Unknown; as long as it takes for you to make the pet beautiful. 
Cure: Comb his hair and put some clothes on. 

Flea

Length: 3 days. 
Cure: Wash it with an anti-flea shampoo. 

Worms

Length: 3 days. 
Cure: Let him eat anti-worm food. 

Your pet in inventory:
Open the cage that your pet is in and tap him. Then, select "Put in inventory".


Cheap food:
In the beginning you can only cook eggs. Stick with it. Making harder food costs more items and is just as effective.


Hilary Duff:
If you treat Hilary Duff's pet well you will get more people to come over to you to treat their pets.

Extractor:
When treating a pet that has swallowed something, you can extract the item from the belly to get a free item. The next day when the owner comes to pick up the pet you get will get money and an item.

Cooking:
If you cannot cook well, buy a microwave or a refrigerator and select "Snack". You can be full without having to cook repeatedly.

Increasing comport and energy levels:
To get your comfort and energy level up, go to the bed and select "Nap". If only your comfort level is low, sit on the couch or a chair.

Moving out:
When buying a new house, your house will be in your inventory. If you want to move just "Use" it. You will be asked if you want to move out. Tap "Yes".

Worms:
If you have tried everything else and the only possibility that remains is worms, you can feed the pet anti worm food. You can save time if you feed him the anti-worm food immediately.