Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
No worries about the Emergen-C. That should not cause any issues. However, the Halls Defense is potentially a big problem because it contains xylitol. I am very worried for your little dog and because of her symptoms must recommend you proceed to your closest emergency clinic for a check to ensure there is no hypoglycemia associated with xylitol toxicosis. This can be potentially life-threatening hypoglycemia (low blood sugar), with difficulty walking, and even collapse and seizures.
Your larger dog is at low risk with only 2-3 of the Halls tablets possibly eaten.
Your smaller dog may be only experiencing normal gastrointestinal upset from eating a variety of unusual items, which would be our best case scenario, but due to concern about xylitol, I would not take a risk with a wait-and-see approach. Better to proceed with safety, which means have her examined tonight and have her glucose level checked.
I am at a point I need to know what questions you have. We can continue our dialogue in this setting.
I hope that the information I provided has been helpful.
Please remember to select REPLY TO EXPERT if for any reason you need further clarification, have more questions, or were expecting a different type of answer.
My goal is to provide the best answer possible prior to you leaving a feedback rating.
If you received all the information you needed, then kindly submit a rating.