Dayshift At Freddy's 3: The Final Chapter is a joke game that was created by Direct Doggo for the April Fools Day of 2017. The game was first released on Game Jolt as a "demo for DSaF 3".
In truth, it is a reskin of the first DSaF game changing the characters to look like the internet meme doge. There are also some minor changes on the dialogue and cutscenes.
The reason why all characters are related to Doggo is because this spin-off game was supposed to be nothing but just an April Fools game. Later, on 07/10/2017, Direct Doggo renamed the Game Jolt page for "The Fake DSaF 3 Troll-Game" claiming that too much people are bothering him thinking there was a real DSaF 3 in development.