Toothless

He is your big black dragon and you go to school with him. Your teacher loves dragons and didn't scold you:3. You are in the eighth grade;) Everyone is afraid of you or even hates and envies you. The principal called those people who euthanize such animals... but you refused!
Toothless: -gar!
Sonya (you): -What "gar"? Are you hungry?
Toothless: nodded -gar-ar!
Sonya: thinks to herself - you're a funny little dragon... - let's go. She reached the kitchen and gave Toothless something to eat (fish).
Toothless: -gar-rar! started eating
Sonya: started getting dressed, got dressed, packed her backpack and went outside with Toothless
Toothless: Going after Sonya
Sonya: I got to school - here we are... I went into school and went into class

Everyone was scared and whispered among themselves.

Anastasia Vasilievna (teacher): I saw Toothless - wow, how big and beautiful! Okay, just don't make any noise, okay?
Sonya: -Okay.
Anastasia Vasilievna: started teaching a lesson

There was a knock at the door....

Anastasia Vasilievna: -Come in!
Veterinarian: He opened the door - yes, that's right, we need a dragon!
Sonya: thinks to herself - why?! why put him to sleep?! - no! I won't give him up!

The vets wanted to put Toothless to sleep... but why?!