First, its good that her gums are pink despite the wheezing, coughing, and choking you reported. In that case, I suspect all of those signs are due to inflammation of her esophagus secondary to her vomiting. So, if we can soothe her stomach and halt her vomiting, we should be able to reduce those for her too. And I would note that breathing slowly isn't as much a worry as fast as long as she isn't collapsed here.
Now at her age, we do have a few concerns for the signs we are seeing. Common causes we need to consider include bacterial or viral gastroenteritis, pancreatitis, general dietary indiscretions, and ingestion of harmful items (ie toxins, plants, non-edible items). Now hopefully she didn’t eat anything she should not have, but if we aren’t sure about that or Angel’s belly comfort; then we do need to keep a close eye on her and check the house for any hints of anything she may have chewed or eaten.
Otherwise, as long as she isn’t constantly vomiting, we can try some home supportive care to see if we can settle her stomach. To start, if she hasn’t just vomited (since otherwise we’d need to rest her stomach for a few hours first), then you can consider treating her with an antacid. Common pet safe OTC ones we can use include Pepcid (More Info/Dose @http://www.petplace.com/article/drug-library/library/over-the-counter/famotidine-pepcid), Zantac (More Info/Dose @ http://www.petplace.com/article/drug-library/library/over-the-counter/ranitidine-hcl-zantac), or Tagamet (More Info/Dose Here @ http://www.petplace.com/article/drug-library/library/over-the-counter/cimetidine-hcl-tagamet). Alternatively, we could use Milk of Magnesia (0.5 tsp every 8 hours) for her either with one of the above or instead. The bonus of this antacid is that it’s a liquid and will coat her throat to reduce that irritation for her. Whichever you choose, we’d give this 20 minutes before offering food to allow absorption. Of course, do check with her vet before use if she has any known health issues or is on any medications you didn’t mention. As well, if you try this and find her nausea too severe to keep it down, then that is usually a red flag that we need her vet to bypass her mouth with injectable anti-vomiting medication.
Once that has had time to absorb and she is steadier on her stomach, you can consider starting her on a light/easily digestible diet. Start with a small volume (a spoonful). Examples you can use are cooked white rice with boiled chicken, boiled white fish, cottage cheese, scrambled eggs, or meat baby food (as long as its garlic/onion free). There are also OTC vet diets that can be used (ie Hill’s I/D or Royal Canin’s sensitivity) too. When you offer that spoonful, give her 30 minutes to settle. If she keeps the food down, you can give a bit more and so on. As her stomach stabilizes, you can offer more. The aim of these diets is that they will be better tolerated/absorbed by the compromised gut. Therefore, it should get more nutrients in and result in less GI upset. As long as improvement is being seen, I usually advise that the diet be continued until her signs are settled, and that they are then slowly weaned back to their normal diet.
Overall, a wide range of agents could trigger the GI upset we are seeing but those other signs sound like a secondary esophagitis. Therefore, in Angel's case, we’d want to start supportive care to settle her stomach. If she cannot keep that or water down, appears dehydrated already, or doesn’t respond to the above within 12-24 hours; then we'd want to get her vet involved. They can assess her hydration, rule out fever, make sure there is nothing in her stomach that shouldn't be there or any sinister viruses present. Depending on their findings, her vet can treat her with injectable anti-vomiting medication, gastroprotectants for her throat, gut safe pain relief +/- antibiotics to settle her stomach, and get her back feeling like herself.
Please take care,
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