Asuntol in powder form. Made by Bayer. Just mix with water and bathe the dog.

Boil water and pour in corners, nooks and crannies around (outside) the house to kill the young lice.

Have it injected with...(the vet knows the name)...the drug goes to the blood which is sucked by the garapata. The garapata is killed though he is in the innermost recises of the dogs anatomy.

If you just focus only on the body of the dog, you might fail to completely halt the multiplication of the lice. Should be total approach...