Why are my dog's hives lasting a week after kennel cough shot?

I would be concerned that there is still swelling, potentially irritating the trachea or throat if Apollo is also now coughing and the hives haven't resolved after two days of home treatment. If this continues or worsens it would be best to seek veterinary care to have Apollo examined and treated with a strong medication to help stop the allergic reaction, especially if he is having swelling of the face or neck, or is having trouble breathing.

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!

It sounds like she could have had a vaccine reaction as they typically happen soon after being administeted the vaccine. Your vet will likely want to give her injections or steroids and diphenhydramine, and may keep an eye on her to make sure the swelling goes down. In the future she may need pre-medication prior to being vaccinated to avoid another reaction.

That is odd. It may mean that she needs a longer course of steroids and antihistamines. I also recommend to check her for ANY skin masses (both above and below the skin). There is a skin cancer called Mast Cell Tumor which can cause hives. You may also want to discuss checking a CBC with your vet to see if any of her blood cells are abnormal. Have Scout examined again by the vet and discuss next steps. I hope this helps.

Thanks for using Petco Pet Education Center, formerly Petcoach! This is most likely secondary to an allergic reaction. This was probably caused by an allergy to something in the environment. If this does not resolve shortly, he should be evaluated by a veterinarian for treatment of an allergic reaction. This is usually treated with an anti-histamine medication and steroids. Good luck and have a good night!

Poor Osborne! Unless you have already done so, I recommend to take him into the vet to likely get some steroids. Sometimes the immune system needs a combination of antihistamines and steroids for 1-2 weeks to calm down and stop reacting. It’s unusual to see this type of reaction for so long. The doctor may also talk with you about checking a CBC to look for an abnormality in the cells and to check any skin masses he may have for a specific malignant tumor called a Mast Cell Tumor. These could both cause persistent hives but that’s an unusual presentation for both conditions. I hope this is helpful and please feel free to post any additional questions.

You should call your vet and give him/her an update. If the hives started after giving the antibiotics then your vet may want to switch to a different antibiotic in case it is an allergic reaction to the antibiotics. Your vet may also want to prescribe a corticosteroid to help treat.