Zack got terrible big mats behind his ears one time when i was so focused on flea combing his body, i forgot to comb and brush the rest of him.
On advice from cavalier talk people, i got an awesome detangling comb made by 4 Paws, a special kind of comb with a special shape and spacing of teeth, and i got one of the two detangler brands that the store had, the one that was recommended as pleasing customers, Perfect Coat Clear Choice 8 in 1 Grooming Spray, below is info from an ad, you can use it wet or dry, very little goes a long way, the only thing i didn't like was the floral scent, i like unscented things, but it was a nice scent. I just don't like perfumed scents. Anyway, i had great success, didn't have to cut any mats, and haven't had any since. I credit both the comb and the detangling spray.
Perfect Coat Clear Choice Grooming Spray is specially
formulated to release mats and tangles from wet or dry
coats. Conditions coat and cuts brushing time.
Non-greasy, non-oily formula leaves coat manageable
and lustrous without irritating the skin. Fresh
fragrance. Directions: Dry Coats: Hold sprayer six
inches away from coat. Avoid contact with pet's eyes.
Badly matted areas should be saturated, allowing extra
time for penetration. Towel matted area before
brushing. Brush or comb thoroughly. Wet Coats: Shampoo
coat and rinse thoroughly. Towel to remove excess
wetness. Hold sprayer six inches away from coat. Avoid
contact with pet's eyes. Spray coat with Clear Choice,
being sure spray is applied evenly over entire coat.
Matted areas should be saturated. Towel dry. Allow
extra time for spray to penetrate badly matted areas
before towel drying. Begin brushing or combing,
spraying lightly if needed.