The problem in the park

We were walking in the park, my dog​​, my girlfriend and me.
All we were enjoying the scenery that nature was offering us, you could smell the fresh air, you could hear the birds singing and the squirrels playing in the trees, you could feel the air you refreshed your body, was fabulous.
when suddenly my dog ​​behaved very strange, as I had seen a squirrel ran without hesitation catch, I let go of his hands and ran along with him to stop, the Priscilla saw that the dog was still and quickly climbed the tree.
My dog ​​is barking at the squirrel down in that arrives and I could catch, grip it very hard to not let go of me and we walked back to our house.