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Hi, Customer. Thanks for your question.This could turn out to be a benign stomach upset. That said, because we know that mast cell tumors can cause histamine release in the body which can secondarily cause acid release in the stomach, which usually manifests itself as vomiting and reluctance to eat I would go ahead and approach this from two directions.First, we typically give antihistamines to reduce the histamine release in the body from the mast cell tumor (MCT). Many vets will recommend that following the diagnosis of a MCT that owners give regular dosages of antihistamines to reduce the risk of histamine-related issues in the body. It doesn't sound like this was expressed to you, so it may not have been a concern at the time.Unfortunately, because she's vomiting, the chances that she's going to vomit up an antihistamine is pretty good. So, we can try using an antacid like famotidine to reduce the possible acid buildup and later on give the antihistamine.Again, this could be way off in left field for her condition but because we know that she has an MCT we should aware that it could also be causing the issue. In a case where her stomach is simply bothering her, famotidine should work well and benadryl won't hurt.There's more info here: http://www.dogcancerblog.com/blog/why-benadryl-for-mast-cell-tumors/In your shoes, I would give a dose of 0.5mg/pound of body weight of regular pepcid (famotidine) that you can pick up OTC in the pharmacy section of any grocery store. 2 hours following this, offer a small amount of water and see if she holds it down. Move on to a few pieces of boiled chicken or similar that is very bland (boiled egg will work too). If she holds that down, then move on to dosing the antihistamine which is benadryl in tablets or capsules. You'll give 1-2mg/pound of body weight of benadryl orally.The famotidine and benadryl should be kept up around the clock every 12 hours until she can see your vet. If this continues to be an issue for her, she needs to go to the ER to be checked. MCT are nothing to fool around with when it comes to a pet's overall health and they can cause major life-threatening issues in rare cases. Because she has some of those 'borderline' symptoms, make sure to approach this promptly if she worsens or does not improve.
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Checking in. How is she feeling?