If you want to buy professional scissors or shears for dogs, it is important to consider the specific purpose and type of coat. Regular thinning dog grooming scissors, also called thinners, have serrated blades. You can use these hair thinning scissors to easily thin a thick, heavy coat and shape or model the coat where needed. In addition to the thinners, there are also blenders and chunkers. These types of scissors have one side with teeth and one smooth side.