Love this simple home made craft. It is designed so that the feeder of a greedy dog sprinkles biscuits/kibble/dry food on the mat giving the dog a challenge to find and retrieve the food.
Simply made with an inexpensive sink mat (mine Addis 30 cm approx square) with lots of drainage holes in it. Spend 20 minutes cutting a metre of fleece into 2.5 x 10 cm ish strips. Then sit in front of the tv knotting the fleece through the holes. Thread a strip up and down through adjacent holes and tie a single, simple knot to secure each strip until every hole is filled.
I used a thick fleece so stopped when the back looked like this. I finished by threading and stitching a 20 cm strip of fleece through a corner hole to make a hanger. This mat is washable and easy to make.