The skin is thick and loose but fits smoothly.
Thick skin is important to protect the Boerboel against whatever may want to attack it. The thickness of the skin is relative to the hair count per inch of coat. The higher the hair count, the thicker the skin. The skin is loose fitting, so you can easily grab a handful around the top of the neck, but it is not like a Shar Pei, where the skin is wrinkly and hangs all over the body.
A small dewlap is permissible and moderate wrinkles over the forehead when the dog shows interest.
Too much wrinkle can cause problems like entropion and ectropion, and no wrinkle lessens the characteristic, intelligent look of the Boerboel.