What is an anaphylactic reaction?

An anaphylactic reaction or anaphylaxis is an immediate hypersensitivity (allergic) reaction to a foreign substance, especially a foreign protein, known as an allergen or antigen. What causes an anaphylactic reaction? ​Before an anaphylactic reaction can occur, the pet must have had a previous exposure to the offending substance. A common example is a dog stung by a bee that […]