First, I am glad to hear that she isn't likely to have eaten anything non-edible to cause herself a blockage. With this aside, it sounds like she has tenesmus. This is a condition where they strain like they need to pass stool because the colon is inflamed and making them feel like there is stool to be passed. And if the colon is inflamed and she does strain, that can then trigger the vomiting center in the brain to lead to mild vomiting.
In regards ***** ***** for this, we can see inflammation triggered by diarrhea inducing infections but also inflammatory colitis, anal gland issues, parasitic/protozoal infections (ie whipworms, giardia, etc) and general dietary indiscretions or gut infections. As well, at Chloe's age, we'd also have to be wary of more sinister issues like tumors compressing the gut or thickening it from the inside. With how sudden this has started, we'd hope that isn't the cause but it is something we need to keep in mind.
With this in mind, we'd want to try some supportive care to see if we can get her settled. To start, we can reduce her nausea with an OTC antacid (ie 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)). 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. 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. 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. Whichever you choose, I'd note that you can add some fiber (ie canned pumpkin, all bran) to this as it will bulk up loose stools but also push anything caught in the gut through. 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.
Finally, since these kinds of upsets can be related to parasites, you can consider worming her at this stage. Ideally, we'd use Panacur (fenbendazole) to counter worms but also some of our protozoal concerns. And we could also start probiotics (ie Fortiflora) to help stabilize her good gut bacteria. Finally, you can also choose to use a low dose of OTC Kaolin/Kaopectate (1-2 ml every 8-12 hours) just as a means of coating the gut to reduce irritation.
Overall, Chloe's signs do raise a few concerns. For the moment, we can use the above to reduce her nausea and try to reduce her colonic irritation. Though if severe, if she doesn't pass stool normally, or doesn't settle in the next 12-24 hours, we'd want to plan to have a check with her vet to rule out those other concerns and get this settled for her.
Please take care,
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