Man’s Best Friend is a secondary quest you can pick up while exploring Velen. It involves war-starved children and a dog.
In front of a cottage near the Inn at The Crossroads, there is a dog howling by a campfire.
Following contains quest spoilers. You’ve been warned
Investigate the scene
After you defeat the dog, use your Witcher senses to investigate the scene. You’ll hear voices from inside the cottage. It’s four hungry children.