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You can use baby aspirin as long as the dog is not on another NSAID from your vet such as Rimadyl.
Aspirin should not be used long term as it can cause stomach ulcers so two or three days tops. I would call your vet and ask for a safer anti inflammatory medication, one that will not hurt the stomach like aspirin has a tendency to do.
Make sure you give food beforehand to coat the stomach.
If you have to move him to get him to the vet it might be easier to put a meal in a crate and then then move the whole crate to the car. This way you are not distressing him. At his age he should be checked for other health issues and the Vet office can clip his nails for you.
Here is aspirin dosing http://www.petplace.com/article/drug-library/library/over-the-counter/acetylsalicylic-acid-aspirin