Welcome to Justanswer! I am Dr Altman and happy to assist you both today!
I am so sorry your young friend is having these symptoms.
Luckily these ant baits are not toxic but the plastic case can cause an obstruction and be the source of her vomiting if she ingested it. First, please stop forcing fluids and inducing vomiting. If she takes anything in orally with an upset stomach or an obstruction it will simply result in further vomiting and therefore dehydration. If we remove food/ water for 12 hours after the last vomiting episode to allow the intestinal tract to rest and reset then we can begin water first and then food. But if the vomiting is not subsiding I do strongly advise a veterinary exam to ensure that she is not suffering from an obstruction or requires injectable medications to control her symptoms and minimize dehydration
1- Keep indoors to avoid eating grass/ leaves for 12 hours from last vomiting episode
2- Offer a small amount of water (1-2 teaspoons hourly) for a few hours
3- Start Pepcid (famotidine) 10mg 1 tablet every 12 hours OR prilosec (omeprazole) 20 mg 1 tablet daily for the next 3 days with the second administration of water (crushed if needed)
4-If no vomiting, offer small amount of white rice and boiled boneless or ground chicken or ground beef. For example, one tablespoon hourly for a few hours then slowly start to increase the amount while reducing the frequency. Keep on this diet for several days then wean into regular diet.
5- If vomiting continues after doing the above, I would encourage having your family veterinarian perform an examination to determine the next step to getting her comfortable and whether she has severe gastroenteritis or a foreign body obstruction that potentially may require surgical intervention
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Indications your dog should be seen by a veterinary er sooner include: sticky gums that are pale, yellow, blue, purple, temperature rectally >103.5, progressive lethargy with less responsiveness to you, vomiting or diarrhea that includes blood, resting respiratory rate (breaths per minute) >60, swollen abdomen.