You asked for it, we made it!  
 
This version of our unicorn dog costume has a more pastel / girly colored mane and a sparkly (yes, that's right I said SPARKLY) white yarn.  
 
This is a one piece photo prop designed for medium to large breed dogs.  It features a yellow unicorn horn and a pink, purple and blue colored "mane" (made from brushed yarn) on a white head piece.  It would make an easy and fun costume for your four legged friend.
 
Wearing instructions
 
Simply place the headband portion of the hat on top of your dog's head and gently slip the ears through the ear holes.  You can use the tie strings to secure the hat in place.  The main will dangle down along your dog's neck.
 
Measurements and Sizing
 
This hat is intended for us for medium - large breed dogs (as shown on a golden retriever). 
 
 Below I have included approximate measurements of the headband: 
5.5" / 14cm across the forehead (from the start of one ear hole to the start of the other)
12.5" / 32cm long from end to end (the base of one ear hole to the base of the other)
Each ear hole is approximately 2.75" / 7cm long by x 2" / 5cm wide
Each tie strap is 12.5" / 32cm long