Natural anti-inflammatory supplements

My 10-year old belgian malinois is starting to suffer from joint pains brought by arthritis. I know anti-inflammatory and pain medications will now be a start of his "twilight  years" but as much as possible I don't want to fill him up with drugs that give more risks and side effects than benefits. I am now looking for natural anti-inflammatory supplements or drugs that can alleviate painful symptoms of arthritis and joint problems. 

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