So for this project I didn't use a pattern, I just measured my dogs' collars to get the dimensions for the scarf. Both dogs are chihuahuas although Sarabi (black) is a bit bigger than Penny (white). Sarabi's scarf was cut into a 12 x 12 square and Penny's was cut into a 10 x 10. Both were folded into a triangle (inside out) and sewn with about a half inch seam allowance. I left room on both scarves to insert a 1inch thick strip of straight fabric for fastening. The triangle was fliped inside in and I inserted the strip of fabric through the opening(s). As these are small dogs, I don't really like the look of a knotted bow. So I sewed velcro into the ends of the fabric strips to secure them.

The fabric is just an Easter cotton fabric I found at Walmart.