The swelling occurs 30 minutes to a few hours after the exposure. A veterinarian will often give dogs with this reaction an antihistamine injection. Untreated, it may take a day or two for the swelling to subside. A different reaction we see 6 to 24 hours after exposure to the antigen is hives. 21 июн. 2016 г.
How long does it take for an allergic reaction to occur in dogs?
No matter what the cause, an allergic reaction can occur immediately or up to 48 hours later. These reactions can range from mild to severe and life-threatening, so if your dog shows these signs, contact your veterinarian as soon as possible.
How do you know if your dog is having an allergic reaction?
Itchiness and Hives If you notice your dog scratching a lot or see hives or redness on his skin, then he may have an allergy. These reactions are common in all types of allergies. If they are the only symptoms you notice, you can wait a day or two before scheduling a vet visit.
Are dog allergies immediate?
Up to 50% of people with an animal allergy do not experience immediate symptoms. Additionally, many people with an allergy are actually sensitive to multiple allergens not just from their dog or pet, and so should focus on reducing all allergens they are exposed to rather than simply addressing their pet allergy alone.
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