Thunder

I have a dog called Thunder who is very special to me. My family has had him since he was a little puppy. It was a funny moment when we picked him. We went to a kennel near my house, where there  were many Rottweilers who were  being sold as watchdogs. The kennel owner decided to have more dogs, therefore there were nine little puppies that we could choose from. My brother had the responsibility of choosing our new pet, for it was  to be a kind of a gift for him. All the little dogs were so cute despite the fact that they were Rottweilers,because they were pretty calm. Except for one. That one could not stop  running around, trying to play with his brother and with us as well. This crazy little puppy was different from the others. Not just for his manner, but because he was the smallest  and also the cutest one. The obvious happened, my brother chose that dog. As an  Oklahoma City Thunder fan, I suggested to my brother to give the name Thunder for our new pet, and he accepted. Thunder is  now 2 years old, and I can say he is part of our family.

You write quite well. If you refer to an animal as ' it' that means that the animal has been neutered.