Just like people, it is possible for a dog to have an allergic reaction to something such as a bee sting, a medication, or a vaccine.
Most allergic reactions improve quickly with treatment from your vet, but occasionally they can be life threatening. Serious allergic reactions (anaphylaxis) can be deadly and require a rapid response.
Contact your vet immediately if your dog begins to show signs of an allergic reaction.
This article does not cover chronic allergies such as food allergies, flea allergies or pollen allergies (atopic dermatitis). Separate articles with information on these conditions are available.