Dogs suffer from many of the most common human ailments---pain, allergies, diarrhoea, constipation---and their symptoms can sometimes be treated with the same over-the-counter medications. According to the veterinarian-owned website www.PetEducation.com, some medications for humans are safe for dogs in certain dosages. Confirm all treatments with your veterinarian.
For pain or fever, give dogs buffered aspirin. Give 5 to 12 mg per pound every twelve hours. Use buffered aspirin only and do not give acetaminophen or ibuprofen.
Benadryl® can be used for allergic reactions in dogs. An itchy, sneezing dog can take 1 to 2 mg per pound every eight hours. It may make him drowsy.
Kaopectate® can be used to control diarrhoea. Give 1ml per pound of body weight every six hours but be aware that prolonged use can cause constipation.
Pepto-Bismol® can also treat diarrhoea. Give 1ml per 4.54 Kilogram every eight hours.
Hydrogen peroxide can be used to clean wounds and induce vomiting. Check with your veterinarian before inducing vomiting; some toxins should not be treated this way.
If your dog is prone to car sickness, you can give her Dramamine. Give her 2 to 4 mg/pound 30 minutes before the trip. It may cause drowsiness and dry mouth.