Please do not give your furry friend any people drugs that have not been ordered by a vet. Although some medications are the same, the doses vary quite considerably and you could accidentally harm, or even kill him, instead of giving aid.

With the cold winter temperatures that you have at the moment, his pain could be caused by arthritis, even though he's only 4, so rather than drugs that could possibly hurt him, try keeping him as warm as possible..... especially his joints. Use a hot water bottle, or an electric heat pad on low heat, until you can get him seen by his 'doctor'.

Even if his pain turns out to have been caused by something different, you won't have harmed him and he'll probably love you more for the extra warmth to keep away the winter blues.