Rats! Well, I have already done it with only one seam...so it's going to have to do, but I will definitely keep that in mind for the next time. I am in the process of loading the frame now, and I did put the seam left to right. So I did one thing right anyway...good thing it is only meant to be a utility/practice quilt to put over the back seat of the car when the dog rides along.
Thanks for the input. I knew I could count on you folks.