With that much diarrhea and 6 pound dog, I would be very concerned about dehydration. Check him gums and tongue to make sure they are moist and pink. Is he lethargic? I would go to the ER if he is, or if his gums are pale and sticky.
If not, do you have Nutri Cal or white Karo syrup on hand? I would have one of those just in case and directions to your nearest doggy ER.
I would call your vet first thing in the morning. This sounds like more than a Frontline reaction.
Keep us updated.
__________________ Kristin, Max and Teddy
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