Canine Cottages fitted some dogs with heart rate monitors to discern what makes their tails wag in happiness.

They found a dog’s heart rate increases by 46% when they hear the words “I love you” from their owners.

And that dogs’ heart rates calmed down by 23% while being cuddled.

Expressing human emotions has never been more crucial than in our world of click, scroll and send so words of endearment can be powerful ways to make others happy.