He wasn't always what you thought he was. He used to be a happy child. Not in public, God no. But he was when he was alone. Even though he was never really alone. He always had John.

Equipped with a tiny backpack and a fitted school uniform, Sherlock Holmes made his way from his manor to school and back again. Upon his return, his uniform had become untucked in places and his bag would move from his back to his hand. He was always greeted by an energetic John, and it always made him smile.
Sherlock first met John at the nearby pet store, and he immediately became infatuated with him. John was a golden Labrador puppy with blue eyes, which was unusual for a dog. After deducing loudly that the store owner was having several affairs and was going bankrupt and on the verge of starving the animals at the store, Sherlock managed to get his puppy for free. Mycroft's route home from his school led him to cross paths with his younger brother. He didn't bother to ask trivial questions about the new addition to Sherlock's life, but instead asked one important question:
"What are you naming him?" Sherlock gave this a small thought and he settled on
"John."
"Oh. Why?"
"I'm bored with fancy names like yours and mine. I just want his name to be plain and easy to remember. John."
"I see," John let out a small 'yip' from Sherlock's backpack, which made him smile.

Throughout his teenage years, Sherlock found solace in his companion. He could take the abuse at school, that was no problem. He just wished there was someone who would be there for him like John. His once clean look of a boy representing the school dress code had altered to a pair of black skinny jeans with converse shoes covered over with a baggy white dress shirt that hid his palms and abdominal area. His small backpack still clung to his back, but one of the straps always found itself halfway down his left bicep.
He dumped his bag onto his bed, waking John. John barked at him quietly and put his head on a cushion. Sherlock walked past, rubbing John's head and sitting down at his desk. John let out a long breath that sounded like a sigh and watched Sherlock, who was watching the house across the road from the manor.
Sherlock had a strange theory. Ever since he first saw that girl getting changed with her window open he thought she was an idiot. Then he wondered why he thought she was an idiot and not 'hot' like a typical male thought. His theory is that if he watches her enough times, something in his brain will kick in and he'll at least have something a normal boy should- an interest in women. At the moment, however, he was stuck with being asexual. John huffed at him again and Sherlock closed the curtain.

The next day, Sherlock's interest peaked when the house across the road had adopted a 'For Sale' sign. He had grown bored of deducing what happened in the everyday lives of the current owners. New owners would keep him entertained for a while.
The day they moved was a weekend, so Sherlock busied himself with his window again. John sat on his bed and looked out the window with him.
"See that, John?" Sherlock pointed at a bed that was being placed in the mover's truck, "that's the parent's bed. Their second daughter has had sex five times on that bed with her boy...no, girlfriend," John let out a small bark and wagged his tail. Sherlock petted his head and smiled, "that lounge has had five previous owners, all of whom got rid of it at a second hand shop. No, wait... one of them found it at the dump."
The rest of the day continued like this. After the family left, Sherlock busied himself with a book on forensic science. He shivered at the cold air blowing in through the window and snarled as a snowflake landed on the page and melted. As he reached to close the window, he spotted a gleam of the sun's reflection from an item in the house across the road. Naturally curious, he put on his jacket and scarf and headed downstairs. He winced as Mycroft caught him on his way to the door.
"And you're going where?"
"I'm taking John for a walk." he lied. Mycroft smiled at him and locked the door.
"John's asleep in your room,"
Traitor, Sherlock thought, "Fine. I'll just go for a walk by myself."
"I'll join you then," Mycroft unlocked the door, still beaming with his annoyingly smug smile. Sherlock growled and followed him out the door.

"Sherlock," Started Mycroft halfway down the street. His black umbrella was stained with white spots from the snow, and he was looking blankly into the distance, like his brother.
"What?" Sherlock replied.
"You were going to go to the house, weren't you?"
"It's none of your business."
"It's none of yours, either."
"Can we go home now?" Sherlock snapped. He didn't wait for an answer, turning instead back up the street. Mycroft smiled and slowly paced behind him.
No sooner had Mycroft reached the house than he had bumped into Sherlock. He snapped out of his daze and looked at Sherlock's face. It was twisted in anger. He followed Sherlock's gaze to the object of his fury- the small black car in the driveway. Mycroft took Sherlock's hand and firmly led him across the estate and towards the manor. As they reached the car, Sherlock made the effort to spit on the wheel like a derelict child. Mycroft found it disgusting, but not unusual under the circumstances. As they reached the door, Sherlock twisted out of Mycroft's grip and grappled on to one of the columns, aiming to climb to his window. Mycroft pulled him down and glared at him. Sherlock glared back as Mycroft slowly opened the door.
"Mycroft!" bellowed the car's owner, "what on Earth are do doing out in this weather?"
"I was going for a walk, Sir," he replied as Sherlock tried to sneak up to his room unnoticed. He had almost made it until John came running down the stairs, greeting Sherlock loudly.
"This was your idea, wasn't it, Sherlock?" said the man, suddenly close to Sherlock. Sherlock avoided his gaze, glaring at the ground with his jaw clenched tightly, "answer me," Sherlock grunted in reply and the man edged closer to Sherlock, their faces barely centimetres away from each other. The aggressive tension between them filled the whole room, and John was suddenly growling and defending Sherlock with his teeth bared.
"Get out of my way, dog!" spat the man, reaching his hand out to push John away.
"Father, no!" Mycroft exclaimed. John snapped at the hand before him, drawing blood from his palms. The Holmes father howled in pain.
"Why the hell did your dog bite me, boy?" he screamed at Sherlock.
"He was protecting me," Sherlock mumbled.
"This is your fault, you know," he growled at Sherlock. Sherlock shrugged at moved his gaze from the floor to his father, glaring at the man. Sherlock's father slapped him brutally across the face, sending Sherlock to the floor with red marks from both the impact and his father's blood, "how dare you look at me like that, you ignorant child. I should have you out on the street for disrespecting me. If you so much as look at me like that again, you can kiss your disgusting dog goodbye."

Sherlock was lying on his back with his hands behind his head. John had joined him on the bed and was using Sherlock's bony arm as a head rest. Sherlock's face was bruised from the impact of his father. He turned to face John, smiling as his companion's eyebrows shifted quizzically as he looked around the room.
"Thanks for standing up for me," Sherlock whispered. John barked softly and Sherlock closed his eyes.

I'm back!
Yes, I know. Exciting stuff. It's been a tad difficult finding the energy to actually write. I have the ideas, it's just I sometimes forget that I'm meant to be writing *ordoinghomeworkcoughcough* I'm getting a new laptop soon, which I can use at my other house (three hours away) and hopefully I'll get chapters done sooner. Now, I know what a lot of you may be thinking, so consider this if you wish :

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***SPOILER ALERT***

There is definitely no bestiality, or any hint of it. I do not like the idea of bestiality, therefore I will not write about it. There will be Sherlock/John slash, but it will be between Sherlock and John WATSON, not Sherlock and John, if you get what I'm saying.
John the dog is an OC, and his significance will be revealed later. I did not change John Watson into a dog.

***SPOILER END***

Thanks for reading :3