How to Spare the Greater Dog in Undertale

Using the Act Command

Encounter the Greater Dog. This will happen automatically as you approach the last snow poff, which really isn't a snow poff at all.

Choose "Act" as your first move. In order to spare the greater Dog, you must choose the Act button out of Fight, Act, Item, and Mercy. After choosing Act by selecting it with Z on your keyboard, choose the Greater Dog's name. You can either press enter or Z to do this. This will bring you to five more options: Check, Beckon, Play, Pet, and Ignore. Use your arrow-keys to choose Beckon, and then click enter (or Z).

Dodge the Greater Dog's attack. Now that you made your move, it's time for Greater Dog to make his. He will send a spear moving across the board that will keep switching between a regular attack and a blue attack. When the spear is in a regular attack you must move your soul away from the attack. When the attack turns blue, hold still and let it pass over you. If you successfully stay still during the blue part, you will not be hurt.

Choose the "Pet" option. Follow the same instructions on finding Act and selecting the Greater Dog's name as last time. Once you have done that, simply select Pet instead of Beckon by moving your arrow-keys and then pressing Z (or enter).

Stay completely still as the Greater Dog attacks you. When his attack opens, it will show an entity that looks almost like the Annoying Dog, only sleeping. Stay completely still at the beginning of this attack. If you do, the dog will stay asleep and bring you no harm through the entire attack. However, If you move at the beginning or touch the sleeping dog at any time, he will launch the word BARK at you and you must dodge it.

Wait for the dog to wake up and play. Play with the dog on your turn by choosing Act, Greater Dog, and then finally, Play.

Go through the "sleeping dog" attack again. This attack reoccurs more than twice, so you must know how to survive it. However, it is very easy in the fact that essentially, all you have to do is stay still! So stay still and let this attack take its course.Greater dog sleeping dog.png

Read the message that pops up after this attack. It will say, " Greater Dog wants some TLC." Give it this tender loving care by choosing the Pet option in the Act menu. After you pet the dog, he will have another turn, in which he inflicts his almost meaningless attack where all you do is stay still. Yet even then you will get a message saying, "Pet capacity is 40 percent."

Choose Pet again. This is your last necessary turn in order to spare the Greater Dog. You will read a narration from Chara saying that, "You pet decisively." This is a good thing.

Escape the last attack. If you move when the attack is normal and freeze when it is blue, you will easily escape any danger.

Choose spare from the Mercy option. Continue your journey in the Underground.

Using the Stick Item

Un-equip your stick. You can use the toy knife, or the glove. Equip one of those, and check your inventory for the stick.

Trigger the encounter. Check the last snow poff, and Greater Dog should come out of it.

Use the stick to spare the dog. Select Item, select stick, and press z. This will allow you to spare Greater Dog by playing with it.