One of the very first quilts I made I gave to my collie I used it to practice free motion quilting and loved seeing her be cozy with it (she is one of those types of dogs that will walk through the house until she finds some fabric on the floor - a small dishtowel or one of the kids' sweatshirts - and then snuggle on that -- she really loves fabric!). Maybe your friend's dog was equally drawn to the love and comfort of your quilt...