Avengers x dog oc Discontinued

The beginning

Serena's POV
    It hurts. These humans have no idea how much it hurts. Them sticking needles in me day after day. I was trained to handle it though. I will not whimper in pain. I will not give them that satisfaction. My name is Serena. I'm a Shetland sheepdog trained for war and therapy. I was about to go on my first mission when Hydra kidnapped me for their experiments. So far I have gained a few new abilities and enhancements. One of my new abilities allows me to pick up a bus full of people. The next one makes me faster than light itself by 10x the normal speed. My enhancements are that my senses of smell, sight, and hearing have gotten a hundred times stronger than a wolf's. Just then I hear yelling and shouting from a few miles away. Two of them sound familiar. If I'm correct its the voices of Black widow and Scarlet Witch. I hear a big roar hurting my ears. The people of Hydra stick me in a cell specially made for me. Just then I hear the attack on the Hydra base commence. After a while I hear feet running towards my cell. They don't sound familiar. I bark letting whoever it is a sign I'm in here. I see two blue eyes look threw the slit in the door of my cell. By the smell of it a man. He looks at me surprised. He opens my cell door and I see a tall man dressed in the colors of the American flag with a big circler shield in the same colors with a big star in the middle. No doubt this us the one called Captain America. "Hey girl. What are you doing here? Ah, never mind. Let's get you out of here, yeah. Come on girl" he called to me
I went with him up the stairs of the base. "Hey guys! It looks like one survived" he called out to some other people. One in a metal suit of iron. Most possibly Iron man. One with arrows in a quiver. Hawk eye. One gigantic green guy in ripped purple shorts. Hulk. No mistaking him. One in armor with a red cape and big hammer. Thor. And one I instantly recognized as Black Widow. Beside her was Scarlet Witch. I ran up to them as the man with arrows bent down and scratched behind my ears. Black Widow gasped and started talking "guys I recognize that dog. Her name is Serena. She was trained by S.H.I.E.L.D. to be adog for war and therapy" she said. Scarlet Witch got a closer look at me and sadly nodded her head. "I recognize that dog as one of the ones they brought in to experiment on" she says. They look at me as the man I know is Fury comes over and says "if that dog was indeed experimented on she might have some powers in need of training. I'm putting you all to find out her powers and train her to use them.
Understood? Good". He walks away as the man who got me out of the cell picks me up and walks to a plane thing. I don't know what will happen next but clearly this is only the beginning.