jasper always hated people. Being a neko boy it makes sense. Preferring quiet places and enjoying rainy weather

that's part of the reason he hates you. Being a puppy boy/girl you're obviously hyper,energetic and loud

you randomly arrived on his doorstep,with a letter talking about how he's now your roommate and caretaker

he acts like he hates you,but in all honesty. He could get used to you

but you can get on his nerves sometimes. Especially when you randomly bark at nothing..