Now I have not heard back but I am worried about your lass.
It sounds like her black stools were before any Pepto and it doesn't sound like she had much of that. If that is the case, our big worry we have here is that black feces. The reason that this is a serious concern because black tarry feces (melena) is something we see when a animal has a bleed in the upper region of the gastrointestinal tract (ie stomach or upper GI). The reason why the blood discolors the feces to black is due to the body digesting the blood as it passes down the intestine.
In regards ***** ***** for upper GI bleeds, the most common causes are stomach ulcers, stomach damage due to foreign body ingestion (the bone is a real worry here!), adverse reaction to some medications, and stomach or intestinal tumors. And it is worth noting that all of these issues would cause loose stools as well as the discoloration plus blood loss will cause weakening. And if the bone is caught low in the gut, that could also give her general pain in the back end.
With all this in mind, we do need to be proactive and aggressive in helping your gal (especially since we cannot see into her bleeding stomach to tell us if there is an ulcer about to perforate the stomach). Therefore, if possible, it would be ideal to get her to the vet urgently. They can help diagnose what is triggering her signs, make sure the bone isn't caught, and get her onto some oral gastroprotectants (ie sucralfate) to coat any open stomach lesions, GI safe pain relief (ie bupenorphine, etc), and anti-nausea medication as needed.
Any delay in having her seen and we’d need to start treating her with an antacid to lower the stomach acid pH. Common pet safe options we can use include Pepcid (More Info/Dose @http://www.petplace.com/article/drug-library/library/over-the-counter/famotidine-pepcid), Tagamet (More Info/Dose Here @ http://www.petplace.com/article/drug-library/library/over-the-counter/cimetidine-hcl-tagamet), or Zantac (More Info/Dose @ http://www.petplace.com/article/drug-library/library/over-the-counter/ranitidine-hcl-zantac). You will want to give these 20 minutes before offering food and under the circumstances you will want to treat every 12 hours.
Afterwards, we can start small meals of 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. They will help the diarrhea but also give the stomach acid something else to chew on. And you can add canned pumpkin to that +/- use OTC Kaolin/Kaopectate (More Info/Dose @ http://www.petplace.com/article/drug-library/library/over-the-counter/kaolin-and-pectin-kapectolin-k-p) to slow her stools (and that is ideal since Pepto has aspirin that can actually worsen ulcers in the stomach).
Overall, I am quite concerned about the signs you are seeing . They are tell us that we have an upper GI bleed that could be a sign of a stomach ulcer or possibly related to the bone being stuck. Therefore, it would be ideal to get her checked right away. If there is any delay in doing so, then do treat her with an antacid now and keep a close eye on for any emergency signs (ie belly pain or paling of her gums).
Just in case you need a local emergency vet, you can check @ http://www.vetlocator.com/ or via
All the best,
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