You can prevent tangled hair from becoming mats by brushing and combing your dog's hair on a daily basis. (petsmagazine.com.sg)
Water proof coats can protect your pet from the wind and rain and stop fur becoming matted if your dog likes to role in the mud. (all-about-puppies.com)
However, Yorkies can easily become a matted mess if the owners can not commit to routine combing and brushing sessions. (puppy-training-solutions.com)