A TOUCHING letter from a dog paying tribute to his former owner after he died following a battle with Alzheimers has gone viral.

The letter was posted by Paisley based Twitter user Kieran Hamilton.

He told his followers on Twitter: "We had to rehome my Grandad’s dog early last year when he was diagnosed with Alzheimers. Sadly he passed away a couple of weeks ago, this came in the post today."

The letter read: "Hello, I'm on my holidays in Spain. I'm sorry to hear about my Dad. He was very kind to me. Lots of Love Winston."

The post has had over 24,000 retweets and more than 166,000 likes.