My dog is in lots of pain

Question
when my family and I got home yesterday (we were shopping and gone for no more than 2 hours) we noticed that our dog had a limp and wasnt putting any weight at all on her back leg we think it might be seriously hurt and we were wondering if there was any type of over the counter medicine we could give her to help with the pain until we can get her to the vet. thanks for all your help.

Answer
She may have tore a ligament in her knee...get her to the vet as soon as you can.  You can give her baby aspirin ... 1 tablet (81mg) per 15 pounds twice a day to help relieve some of her pain--do not give if she has any history of kidney or liver problems or is taking any steroids.