Video game developer Joel Burgess has shared the sad news on Twitter that the dog who played Dogmeat in Fallout 4 has passed away.

In a few Tweets, former Fallout developer Joel Burgess explains how River, the dog who played Dogmeat, was chosen and how he was part of the team. For example, he indicates that she wanted Dogmeat to become more than just an extra weapon for the player, but also a real friend.

To make this a reality, River was regularly taken to the studio just to be with the staff so they would really get to know the dog. In addition, they not only used River’s appearance for the dog in Fallout 4, but also the behavior. Think of the way Dogmeat looks back when the player stays behind and then waits for you.