The blood in the stool is a very concerning symptom. Ideally, she should be checked by a vet and started on antibiotics since there is blood in her stool and she doesn't feel well enough to eat. Anti-nausea medications may also be needed to give her back her appetite.
That said, I can give you some things to try at home to help her. If she does not make improvements or she worsens, you will have no choice but to have her seen by your vet.
To start, an antacid to help settle her stomach and a bland diet to help calm her GI tract. Although she hasn't started vomiting yet, we want to be sure that it doesn't happen either.
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.
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