Because she is vomiting blood, your best bet will be to have her examined. This can be a symptoms that is either completely benign or very major. Through the computer, I cannot tell you which it is which necessitates a visit to the ER/your vet.
Failing this, I can give you some steps to take to help with the vomiting. Once this has cleared, you can give her medication. The first step 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 visit any human pharmacy and buy the OTC 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. Blend this up with water to form a slurry she can consume. 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 adding in pureed baby food in chicken, turkey and similar flavors. Avoid those that contain onion or garlic in the ingredient panel. Work up to feeding exclusively until at least 3 days following the resolution of the GI upset. After this, work on slowly switching back to the regular food that your companion typically eats. During this time, she can be medicated.
Please note: If you're using advantage multi, it may not rid her of roundworms quickly or effectively. Your best bet will be diagnosis through a fecal (especially to be sure that's all she has) and then deworming with an oral medication.
I’ll be standing by if you have other questions. Let me know if I can help further.
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