1 Go to the Recreation room - 2F
Go to the Recreation room on the second floor of the guest house.
2 Examine the book
You will find a big book in one of the corners of the room. Examine the book and you will find the blue dog head inside it.
3 Grab the pendulum from the main hall - 1F
Go to the main hall and Grab the pendulum from the clock.
4 Go to the living room - 1F
Go back to the living room near the dinning room where you first woke up and found yourself with Jack's family.
5 Put the pendulum in the other clock
You will find another clock in the living room. Put the pendulum there to get the white dog head.
6 Go to the Incinerator room - B1
Go to the Incinerator room in B1. Next you will have to solve the Dissection key puzzle to get the Dissection key. (See How to Solve the Happy Birthday Puzzle using Ethan – Resident Evil 7)
7 Get the Dissection room key
Open the Furnace that has a label that says Tamara in the inside (the last one to the right) and open the one that has a hand-print in red. Keep all others closed. You will find the Key in the last furnace to the left after you kill the monster.
8 Go to the Dissection room - B1
Go to the Dissection room which is also in the basement. You will find the Red dog head in here but before you pick it up Jack will take it.
9 You will find it near the Morgue
Go to the Corridor near the morgue. Climb the leader up and you will find the Red Dog head hanging on a chain. Note that you will have to Fight Jack once you grab it. (See How to get the Scorpion key & Shotgun in Resident Evil 7?)