They offer comfort and love in return for food, warmth, cuddles and games.
When we asked owners to post photos of their pets and tell us why they’re the best, touching stories flooded our Facebook site.
One pet helped its owner through chemotherapy and radiotherapy, another was training to be a diabetic alert dog for a girl and a third helped comfort a disabled boy during tough times.
Read More... 5. Cuddly pup Lauren Connor writes: "Lilo - best friend to our daughter and gives the loveliest cuddles." Photo: Lauren Connor
6. Good morning! Kris Gunns posts: "Bug - he always greets me when I get in from work, even if it’s 3am. My best mate." Photo: Kris Gunns
7. Amazing hound Kelly Boothby says: "Bruce 4 years, he's the best dog ever, no words can describe how amazing he is!" Photo: Kelly Boothby
8. Looking chic "This is my little Luna," writes June Lambert. "She is 5 and the most loving and clever dog ever." Photo: June Lambert