Hello,
How can we help you with your Bassett? Do you have a question?
I dont know how much your Bassett weighs or how big this bag is, but I'll give you the important info you need.
For a 40 lb dog: 13.3 ounces of chocolate chips would be toxic
For a 50 lb dog: 16.6 ounces of choc chips would be toxic
For a 60 lb dog: 20 ounces
For 75 lb dog: 25.2 ounces
It is most likely you aren't near the toxic dosing. If you are (dependent on size of bag), you need an emergency vet, as it is too late to induce more vomiting, and activated charcoal treatment would be needed.
Most likely, it was just the diet change that caused the vomiting as well as the caffeine effects. Monitor him well tonight, and try to feel his chest/ heart rate. If pounding, he needs a vet regardless, as he may jut be more sensitive to the effects of chocolate. But if doing ok, you can just feed a bland diet of boiled chicken or boiled hamburger meat and white rice for a day or two, then gradually switch back to normal diet if diarrhea occurs. It would be doubtful for vomiting to continue.
Good luck, and let me know if I can help further.
Christine
Certified Veterinary Technician
Licensed veterinary technician (B.S. Mercy College), 10 yrs in animal medicine and training