My dog has hives on antibiotics, tried Benadryl. When to call vet?

Poor Gia! Please call a vet near you immediately to have her seen to help treat the hives. Since she's had 7 days worth of medication and the hives only appeared today it is not very likely that they were caused by the antibiotics, but I recommend telling your vet about them just in case. Gia may have ingested something she is allergic to or have been bitten/stung by something she is allergic to, and your vet can help direct treatment to prevent spreading of the hives and worsening of her symptoms. If you notice any difficulty breathing that is an emergency situation, as it could indicate a severe allergic reaction, and requires immediate vet care. Good luck and I hope she feels better soon!

This is probably an allergic reaction due to an insect bite or a plant outside. those reactions tend to resolve within 48 hours without treatment. if the swelling becomes too large or if your dog becomes lethargic, take him to the vet in order to get an antihistamine/steroid injection. from your description at this moment i think he is probably fine, but this can change so monitor him closely.

Allergies are definitely a possible cause these hives. Allergies are most commonly due to environmental causes (i.e. pollen) and can start suddenly. Benadryl is usually helpful in these cases, so it may be mange. Mange is caused by a microscopic mite that burrows under the skin. This tends to be very itchy. They usually get this from other animals. It's best to have a vet check the skin. They can check for mange and give better treatment for allergies. For now it's best to give him a bath with cool water using a dog shampoo with oatmeal or aloe as an ingredient. I hope that helps and Dozer gets better soon.

I would recommend taking Oreo to urgent care if the hives have not resolved 30 minutes after giving Benadryl. Oreo may need an injection of a corticosteroid to resolve the allergic reaction, and an allergic reaction can get worse quickly if not treated appropriately.

I would recommend taking Piper to the vet. If she is vomiting and has hives then she could be having a significant allergic reaction. She may require steroids or injectable antihistamines or other medication. Good luck and I hope piper is better soon.

They may resolve on their own in a few hours. If Blue is itchy, contact your veterinarian and discuss antihistamine use. If they worsen or spread or if he develops difficulty breathing, take him to the nearest veterinary ER. Legally, we are prohibited from recommending doses for medications, even OTC medications, in the absence of a physical exam and a VPCR ( veterinarian-patient-client relationship).

Poor Zara. I would recommend taking her to a veterinarian for a good physical exam. Dogs can have allergic reactions which will cause hives and itchy skin. She might need something stronger to help calm her hives and itchy skin that only a vet can prescribe. Hope that helps