Pets can have their happy hormone level increased by over 130% after playing with their owner for over half an hour — and the same goes vice versa. It’s impossible not to smile back when you see wondrous eyes, a curious nose, and a smile with little teeth peeking out to see if you’re already awake in the morning, asking for a pet or a belly rub.

Here at Bright Side we adore animals, and what we love even more is to share their sweetest pics with our readers!

1. We always thought he would grow into his ears…

© oldtupperWare / reddit

2. Colby will stare at you in adoration until you pet him, rescue doggo.

© KarinaJean / reddit

3. The cutest *MLEM* you’ll see all day

© ragonk_1310 / reddit

4. Can’t resist these beautiful blue eyes!

© manwithcam / reddit

5. Hi hooman, wanna go for a walk?

© USA_Time / reddit

6. The snow booped the snoot!

© trappinginauhaul / reddit

7. Boots with the furrr…

© ARussianAndHisBike / imgur

8. He’s only 4 months old!

© stupidfuntime / imgur

9. This baby came straight from a Disney movie!

© lauradiamandis / reddit

10. My Shepherd puppy is in the “Teepee” ear stage.

© ****shaw / reddit

11. These snow white teef!

© Dayman360 / reddit

12. Never seen a happier floofer.

© Neo-Nightswatchmen / reddit

13. So proud of herself for learning to sit.

© Firecorny / reddit

14. Smol partners in crime.

© Walldberriss / pikabu

15. “My face when mom calls me a little tyrant”

© popcornxchicken / reddit

16. Zoe is smiling at you because she knows you got this! Trust Zoe.

© krncrds / reddit

17. The definition of pure joy!

© iReddt / reddit

18. Hooman! Throw ball, I catch!

© sedrok28 / reddit

19. Do you ever look at someone and wonder, “What is going on inside their head?”

© Luke-Laurencin / reddit

Do you have your own everyday source of serotonin? We’d be happy to see your pictures in the comment section below!