Did your vet not tell you that information?????

Try these links - and CALL your vet.

http://wiki.answers.com/Q/Can_you_give_a_dog_ibuprofen

http://www.2ndchance.info/pain.htm (the info below is copied from there, but read the whole page)

Aspirin (acetylsalicylic acid):

In 1899, the German company, Bayer, began marketing the new drug "Aspirin". Over the succeeding hundred years, aspirin became the most widely used anti-inflammatory drug in humans and dogs. It can be purchased in various forms including plain, buffered, and enteric-coated formulations as well as topical creams and rectal suppositories. It begins reducing pain in 1-2 hours after it is swallowed. Aspirin like drugs are called salicylates.
None of them, including aspirin, were ever approved by the FDA for use in pets.

Ibuprofen (Advil, Motrin, Nuprin, Medipren):

This is a great anti-inflammatory drug in humans but it consistently causes ulcers in dogs after 2-6 weeks of use. In dogs, it will eventually cause ulcers of the stomach as well as vomiting. At a dose low enough to not have these side effects, the drug probably does not relieve pain. I do not recommend the use of ibuprofen in pets.