The number of milligrams of a certain medicine a veterinarian gives you a dog varies directly with the weight of the dog if the veterinarian gives a 30 pound dog3/ 5 mg of the medicine which equation relates the week w and the dosage d medicine a veterinarian gives you a dog varies directly with the weight of the dog if the veterinarian gives a 30 pound dog 3 over 5 mg of the medicine which equation relates the week w and the dosage d