Yes, it can be hazardous to dogs.  Make sure to keep the dogs off the area during and after the treated area for several days after.  One the area has been thoroughly watered with an inch of water and has dried, the active ingredient will be off the surface where it can be absorbed through the skin of the feet of the dogs and other animals.  HERE’S a link to the product’s label.  ALWAYS read and follow the directions and prcautions when using this or any other garden product.