Dogs are more tolerant of tylenol than cats, it would take about 7 tylenol to cause toxicity in a medium-large dog, but even ONE Tylenol can be fatal
for a cat! Regular aspirin is safe
for dogs at the appropriate dosage
for the size of the dog, and it should be given every 12 hours, not every four hours like for a person. It is also preferrable to use buffered aspirin or Ascriptin, the aspirin that is coated with Maalox.
I can completely understand your anger at that stupid woman!