What to do for a dog with seasonal allergies?
Your vet may recommend some medication to help your pet feel better and more comfortable during the Read More
What antihistamine is best for dogs?
Hope Hermann
2025-08-23 15:59:34
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Shanelle Fisher
2025-08-16 10:08:44
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Antihistamines such as Diphenhydramine (Benadryl®), cetirizine (Zyrtec®), and loratadine (Claritin®) are commonly used to relieve allergy symptoms or counteract allergic reactions in humans. Antihistamines are usually safe for dogs but can make some dogs drowsy and others hyperactive. OTC antihistamines may contain other ingredients, such as decongestants, that are not safe for dogs. Read the label carefully to ensure that the product only contains antihistamine. Check with your veterinary healthcare team to make sure that the antihistamine you have is suitable for your dog and that you know the appropriate dose to administer.
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Anderson Hansen
2025-08-07 05:11:01
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You can give the antihistamine Benadryl (diphenhydramine) to your dog, but you should always check with your vet first. Although the U.S. Food and Drug Administration has not approved Benadryl for dogs, it is safe in the appropriate dose, and it is commonly used by vets to treat skin allergies that cause itching and scratching. The safest way to give Benadryl is to give it according to the weight of your dog. AKC says the dose for Benadryl is 2 to 4 milligrams per kilogram of body weight, two to three times per day. Other antihistamines can also be given to dogs, based on their weight. These include the below antihistamines: Cetirizine 1 milligram per kilogram of body weight or 10 to 20 milligrams per dog, once or twice per day. Clemastine 0.1 milligrams per kilogram of body weight, two times per day. Chlorpheniramine Dogs under 20 kilograms 4 milligrams, three times per day Dogs over 20 kilograms 8 milligrams, three times per day. The safest dose is different for different antihistamines, so always check with your vet first.
Jacinto Oberbrunner
2025-08-07 03:27:38
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Cetirizine (Zyrtec) ¼ – ½ mg per pound (one 10mg tab per 30-40 lbs) twice daily.
Loratadine (Claritin): ¼ mg per pound (half of a 10mg tablet per 20 lbs) once daily.
Clemastine (Tavist-1, Antihist-1): 0.02mg per pound (one 1.34mg tablet per 65lb dog) twice daily.
Diphenhydramine (Benadryl): 1mg per pound (one 25mg tablet for a 25lb dog) twice daily.
Hydroxyzine: 1mg per pound (one 25mg tablet for a 25lb dog) twice daily.
In any individual patient, one antihistamine may be significantly more effective than another.
Therefore, you may need to try several until one is found that does help, before determining that they are not effective in your dog.
Each antihistamine should be given for a 2-3 week trial before determining that it is not effective.
Antihistamines help to control itching in approximately 1/4 to 1/3 of dogs with skin allergies, especially if started when skin itch is still mild and if used with Omega-3 Fatty Acids.
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