I threatened to k!ll my brother's dogs

I (15M) along with my brother (17M), have basically been living alone together for months since our dad got locked up. It was all smooth sailing until spring break when my OTHER, failure of a brother (19M) decides to come back home after moving out a few months ago. He decided to bring in a really annoying dog and, later, an even more annoying dog.

Let me be clear, I don't WANT to kill them (mostly). It's mostly just my anger issues talking when I said that. It's just...they are so. Fucking. ANNOYING!

They piss and shit everywhere, they tore up my headphones, they tore up my pop-it, and they are so. Fucking. LOUD! Every day and night when my older brother isn't here they just stay RUFF RUFF RUFFING at the door or window until he gets back! We can't even put them outside because they'll still fucking whine!

It's EXHAUSTING. I dread coming home after school because I don't know if I'm gonna step in a pile of shit or find a plushie I liked torn to shreds. THAT'S NOT OKAY! I shouldn't have to hate coming home of some retarded ass dogs! I shouldn't have to hide my belongings up on a shelf just so they won't get torn up by a dog I never wanted in my house! But NOOOO, it doesn't matter to him, because his dogs "uNdeRStAnD hIM!"

And ANYTIME I try to tell him to do something with them, he just shuts the door on me and continues hogging the bathroom while he raps like the wannabe gangster he is. It all came to a head where I found a pile of shit in my room and my aforementioned pop-it torn to shreds in his room, sitting right next to his STUPID dogs.

I just straight up grabbed a knife and pulled it on the dog. I REALLY wanted to just get it over with, just kill the damn thing and be done with it. I won't have go worry anymore. But, of course, my cowardice and good morals won and I just told my brother "If I see another pile of shit in my goddamn room, I'm gutting those damn dogs." I then contemplated feeding both of them chocolate to make the deaths seem more coincidental.

I know I'm probably at fault here, but I am just so TIRED of this idiot making his stupid life decisions EVERYONE ELSE'S problem and still begging for us to do stuff with him.