Why Does My Dog Only Turn Left In A Circle?

Because his left brain is well developed than the right one.

I can honestly tell you that your dog might be really sick and you should take him or her to the vet to get checked out. I know from personal experience because my cat used to walk only in a circle and she got really sick. But don't be afraid to get your dog checked out. The safer the better. I hope this helped.

My granddaughter who is 8 is doing her Life Science Project on our little Chihuahua who will walk about 3 feet and then circles left to go the rest of the way. We are trying to find out as much information as we can for her project for it can make it to CA. State finals. She has never been sick nor does she have an ear infection. She does this all the time and when she is happy. She greets everyone in this manner.  If anyone has any reasons why a dog may do this it would be so helpful. She has seen different Vets. For the project and each one says there are no studies out that we can refer to.
      Thank you so much for your time, Nancy E. And Faith