Mats behind the ears are a very common problem in Pyrs, puppy or adult. Even for those who wear a "regular" collar. Try using some spray conditioner, as it helps to keep the hair from matting, sometimes...<G> Barb Bowes Bo & Chelsea (Pyrs), Flopsy (Pyr Shep) & Machin (Doxie) The more people I meet, the more I like my dog! bamb@monmouth.com