It is thought as many as 90,000 people across Scotland are affected by dementia.
Black labrador Lenny was matched with Jon and Jeannette King in Dunbar, East Lothian, in 2018.
Mrs King told how she “brought joy” to the couple’s lives before Mr King died in January 2021, almost five years after his diagnosis.
Mrs King said: “It wasn’t so much the practical things that Lenny did for Jon – it was the light he brought into our lives as we embarked on this new experience together.
“Lenny made us laugh and smile, providing companionship and comfort when Jon was alone or feeling low.”
The couple had not heard of the scheme before Lenny joined the family.
He now works as an “activity dog” but Mrs King said she wanted others to feel the same love they did in Mr King’s final years.
“Friends commented on how sociable Jon had become after years of preferring solitude.
“Those years were filled with unexpected happiness, instead of the downward spiral we’d dreaded.”