Duffy is an Irish Terrier, who struggles with diabetes. Among other things, the disease caused him to lose his eyesight. Fortunately, his diabetes has now been stabilized with medication and thanks to a recent eye surgery, his vision has been restored.
YouTube user Benjamin May uploaded this video, explaining Duffy's story and the surgery he'd just had. "Here he is seeing my parents afterwards," he wrote.
The description was short and sweet, but thorough enough that we knew we'd need to grab a tissue before clicking the "play" button. If you have the video on mute, one tissue might suffice. MIGHT. If you have the volume up, however, you might need a whole handful.
(h/t Laughing Squid)