Can I Give My Dog Tylenol?

No
Vets occasionally prescribe exact acetaminophen doses for dogs, but the safety margin is narrow and liver damage is the failure mode. Without that direct instruction, skip it. Children's formulations are still acetaminophen.
Source: Pet Poison Helpline
Already ingested? Pet Poison Helpline 855-764-7661

The safe habit

Confirm any medication decision with your veterinarian, who knows your dog's health history and other medications. VetDose shows published reference data, not prescriptions.