Source checked November 12, 2026. Editorial team. Not professionally reviewed.
The explicit warning
VCA says a wagging tail does not necessarily mean a dog wants an interaction or wants it to continue. It describes miscommunication that can end in snaps or bites. RSPCA describes worried and very unhappy dogs as not wanting a person to approach. These are important boundaries, not details to hide below a friendly photo. The site never outputs safe to pet.
VCA Animal Hospitals: Interpreting tail wags in dogs · RSPCA: Understanding a dog’s body language
No bite prediction
A no-green-light boundary is not a claim that this website can identify every unsafe encounter or predict a bite. It cannot. There is no aggression diagnosis, risk score, normal threshold or guarantee that a dog will behave in one way. The reading tools classify kinds of claims, not animals. They do not decide how to handle a specific interaction or emergency.
VCA Animal Hospitals: Interpreting tail wags in dogs · RSPCA: Understanding a dog’s body language
Take actual concerns to appropriate help
RSPCA advises speaking to a veterinarian first about behavior concerns, with referral to a clinical animal behaviorist where appropriate. This page supplies no training, punishment, restraint or desensitization plan. For real illness, pain, behavior or safety concerns seek suitable help directly. An app answer or a reassuring source summary is not a reason to delay it.