I can give you some steps to take at home that should help alleviate the vomiting. I will also include information on a bland, higher fiber diet that should help bush the burr through if that's what is causing her symptoms. I am very concerned about the soft, black stool as this is often digested blood and can indicate a bleed in the GI tract. If these steps don't help to get her back to feeling better by tomorrow morning, she really must see a vet for symptomatic treatment with injectable medications and some diagnostics.
The first thing is to administer a dose of regular pepcid (famotidine) every 12-24 hours. You will want to give 0.5mg/pound of body weight (a 10# ***** would receive 5mg, a 5# ***** would receive 2.5mg, etc). For this, you can buy the brand name Pepcid, or you can use the cheaper, off-brand “famotidine” that’s available. Either will be useful.
2 hours following a dose of famotidine, the time needed for the medication to begin working, you can offer a bland diet. To make this, you’ll combine white or brown rice, boneless, skinless chicken breast and sufficient water for cooking in a stock pot. Boil on medium until it turns to mush and the breast is easily flaked. To avoid more nausea, start with small amounts to begin with and offer the amount every 2-4 hours. A few teaspoons to start is typically sufficient and you can work your way up every 2-4 hours in incremental increases until you’re sure no vomiting will be seen.
If your companion requires a more palatable food, try using pureed baby food in chicken, turkey and similar flavors. Start small and give more as long as no vomiting is seen.
If this does not result in the improvements you’re wanting, it may be necessary to have your companion examined by a veterinarian and injectable medications for nausea administered. I’m particularly a big fan of Cerenia for vomiting as it tends to work quickly, does a great job and works for a full 24 hours. As well, your vet will likely want to start some antibiotics if they suspect a GI bleed with the black stool. Hospitalization may be necessary if she's reached a point of dehydration, too.
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