Benadryl addresses the symptoms of an allergic response or allergies by drying up watery eyes and runny noses, and decreases swelling, sneezing, itching, and more. What to Treat With Benadryl Cats that may need Benadryl are typically ones that have allergies to vaccines or are travelling in a car or airplane, but there are other reasons why your cat may be recommended to take it. Can Dogs Have Benadryl For Swelling - Dog Training Reviews. Does Tea Tree Oil Keep Fleas Off Dogs - wikidog.us.orgDoes Tea Tree Oil Keep Fleas Off Dogs. If your dog has swelling under the neck consider that causes of allergic reactions, include exposure to allergens or recent vaccinations. The swelling and hives often though are more spread out to the entire head, rather than being localized only to the neck area. What is Benadryl - Understanding the Popular Medicine Most dog owners have likely heard of Benadryl. It is an incredibly popular medication that is used primarily for alleviating seasonal allergies. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Fowler on does benadryl help swelling: It decreases the amount of chemicals, such as histamine( hence it is an antihistamine), an allergic person's body produces in response to allergens, which could be anything from pollen and pet dander to substances which cause skin rashes. my dog's face is swollen, her muzzle is swollen on both sides and very firm/hard when i gently squeeze her muzzle. She isn't having any trouble breathing beyond panting, but she is almost 13 years old and pants a lot, so this is not abnormal. Benadryl for dog allergies is an over-the-counter medication more and more dog owners are reaching out for. Many dogs nowadays suffer from debilitating allergies and dog owners seek out information on how to provide their dogs with some relief. Benadryl is taken for treating Swelling. 13,003 patients conversations about taking Benadryl for Swelling, rating Benadryl 2.264085063151912 out of 5 for helping in treatment of Swelling. Oral Benadryl is considered a mild to moderately effective antihistamine. If a pet is having an acute allergic reaction with facial swelling or difficulty breathing, skip the oral medications and go straight to the vet. Questions & Answers. 1. Can you give a dog Benadryl? Yes! Dogs can take Benadryl, for much the same purposes as humans. On the other hand, the dosage is different for dogs, or even a dog the same size.