Agnes The Applehead

Agnes is an Applehead Chihuahua, that's her breed.
She is my canine who I show affection to and feed.
I recently learned that she's four years old, I thought she was a little older.
From time to time Agnes becomes hateful and I have to scold her.
But she's a beautiful dog who I think the world of.
For the rest of her life, she's an animal who I'll love.