Dogs can have allergic reactions just like people. Common triggers include insect stings, plants and medications (including vaccinations).
Chocolate contains a substance called ‘theobromine’ which is toxic to dogs and cats. It’s similar to caffeine and can cause problems with the nervous system, bowels, kidneys and heart.
Infectious hepatitis is a serious disease also known as ‘canine adenovirus’ or ‘Rubarth’s Disease’. It affects the liver and other major organs causing a range of symptoms. Your dog can catch infectious hepatitis from contact with an infected dog, or somewhere an infected dog has been.