Is it safe for a dog to eat Tylenol Sinus?

My Boxer pup continuously gets onto our table in our house whenever we are not home. We came back home tonight, after we thought we moved everything from out of her reach, to find that she has chewed a Tylenol Sinus box, and had eaten a 1 and half of the pills. I know that Tylenol can be dangerous for dogs, and I know Tylenol Sinus is also, my question is how many does it take to cause toxicity caused by Tylenol Sinus? Also, what symptoms will become present? And how long before I can start noticing these symptoms? The local 24 hour vet service costs several hundred dollars, and so I want make sure of a time frame before I got bankrupt going to the 24 hour vet.