So the best advice for a matted dog is prevention!

Brush – Best Double-Sided Pet Grooming Tool For Dog & Cat Hair Matting ..
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Mats are nasty entanglements of hair that may involve the topcoat, undercoat, dirt, burrs, loose hair hanging around and just about anything your dog may have gotten into. Basically, they are pesky little nuisances we'd rather just avoid in the first place if we could! But, because they can be quite damaging and even painful for Rover, the only solution is to remove them before they become more serious matters! Keeping your dog free of them is, unfortunately, an ongoing task that begins by establishing a foundation of regular habits. Dead hair is a breeding ground for mats. A coat that is brushed and clean stays in better condition and is less likely to develop them. But, even with our best efforts, almost every dog owner will inevitably have to "go to ground" with a mat!
HELP! My Doodle Has Mats! | Teddybear Goldendoodles
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Of course it’s best to avoid matting all together by brushing out your dog’s dead hair before and after your furry friend gets wet, but for some dogs, like Rags, tangles are still going to happen and are best dealt with on the grooming table. Just by following these simple steps, I rarely have matting issues with this dog
Photo provided by FlickrMatting seems to occur overnight
Photo provided by FlickrFirst it's tangles, then a small mat and finally a large mat
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All dogs need some grooming, but certain breeds (like the Labradoodle) need more care than others. Long haired breeds in particular have problems with matting if not brushed regularly, or when their coats get wet or muddy. When grooming, owners should take time to find the best dog brush for Labradoodle breeds to ensure it is capable of preventing matting and for the best performance due to the thick nature of.5. Long Coat – Don’t let the intimidation of grooming a long-haired dog overwhelm you. Whether you have a long-haired dog with a coarse coat or a silky coat, a grooming regimen that suits you and your dog will help their coat continue to look their best. A Long-haired dog with a coarse coat has a softer undercoat mixed in. You will need a slicker brush or pin brush and a smooth bristle brush. Longer hair is at a greater risk for matting so have on hand. Start by removing any mats that you find by placing a dime size of on the mat and working it out with your fingers and the brush. Next, using the pin brush, brush the coat out gently in the direction that it grows. Then, go over the entire coat again with a soft bristle brush. Bathe your dog with and afterwards. Long-haired silky-coated dogs, have no undercoat. But as with the long, coarse coat, the biggest challenge in grooming a long, silky coat, is dealing with the mats that often form in the fine hair. Use the to remove all mats and then brush the entire coat with the lay of the hair. After grooming, bathe the dog with Cowboy Magic® and follow with . Dry with a hair dryer, and brush the coat out. (Examples: Shih Tzu, Lhasa Apso, Yorkshire Terrier, Maltese)Short-haired dogs are such a blessing because they never get mats. Medium- and long-haired dogs are another story. Matting seems to occur overnight. First it's tangles, then a small mat and finally a large mat. The slicker and pin brushes are your best weapons for removing mats.For example, for long haired breeds you will want a brush or comb suited for dogs with long hair. You may also want to purchase a dematting comb and a deshedding brush. Your best resource for information on the type of dog brush that is best for your pet is a professional groomer. They work with dogs with all different coat types and they’ll know exactly what you need.