Easing the Pain

My four legged son is growing old and achy. I've noticed over the last few days especially that he's been limping. I've been looking into the many possibilities of treatments mostly over the counter as I currently don't have pet insurance. Joint issues are typically something that occurs when our friends age. I was thinking glucosamine as a treatment. I'm hoping it helps. As it stands right now I'm giving him aspirin as a band-aide. He's tolerating that just fine so I'm hopeful that my next course of action is just as successful. Does any one have any other suggestions or helpful tidbits on the subject?