My Valentino had terrible dandruff. His vet said it was due to dry skin. She had me add Goat's milk and coconut oil to his diet. His dandruff lessened dramatically after about a month. The amount of coconut oil (solid or liquid) per day should be no more than 1 teaspoon per 10lbs of body weight. Valentino is about 27 lbs. so I give him about 2.5-3 teaspoons a day. I divide the amount in half and add it too his meals. I feed goat milk rarely because it is so high in calories.
My first girl got carsick. I used Dramamine (Gravol) for her. Luckily she outgrew the problem, because every time I had to pill her the neighbours thought I was killing her. She screamed her head off! (and of course spit out the pill). She did best riding loose in the back seat. That was in the '60s, and we didn't worry about such things…...