If your doodle dogs are like mine they have a fondness for mud, water and rolling around. Even with regular combing and brushing matts can appear. If I’m in between grooms and the knots are not too big, these are my trusty tools. I know matts can be really uncomfortable for dogs so if they are too bad, and going to be painful to remove, I do snip them out with scissors. If I think it’s going to be ok to try and detangle them I use these two products by Groom Professional and I purchased mine from Amazon. I've also included a link for Animology's Knot Sure detangling spray which I use.