Is dry dog saliva considered impure after it has touched the body or clothes, or can one wash it off, perform ablution, and pray afterwards?

The droppings of a dog are ritually impure, a severe impurity, whether wet or dry. It does not contaminate other things unless one of them is wet at the point of contact. However, if both are dry, whatever it touches does not become impure. When purification is required, the garment or body should be washed seven times, the first of which is with earth, followed by ablution and prayer.