Dogs can have allergic reactions just like people. Common triggers include insect stings, plants and medications (including vaccinations).
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.
Lymphoma is a cancer of the immune system. The immune system is active throughout the whole body, and lymphoma can develop in any part of it. Symptoms vary depending on what type it is, where it is, and how aggressive it is.