Very descriptive, I like it! But, in the beginning (maybe this is just me being brain dead, but) I thought that summer was the season and was extremely confused! You might want to sort that out, and make sure the reader knows that Summer is a dog. (I thought that it was the season, and that you were overly using personification.)
There are some things you can't share without ending up liking each other, and knocking out a twelve-foot mountain troll is one of them. — J.K. Rowling