Tail movement during greeting reflects arousal and must be read with approach shape, facial tension and the dog's ability to pause. A wag does not make every greeting safe.
Start with the full picture
Watch both dogs or the dog and person rather than focusing on one tail. Leads, doorways and confined spaces can remove choices and increase tension.
What to compare
| Observation | What to note |
|---|---|
| Approach | Is it curved, loose and interruptible or direct and fast? |
| Tail | What are the height, width and base tension? |
| Pause | Can the dog disengage and move away? |
A low-pressure next step
Keep greetings brief and allow an easy exit. Skip the greeting when either body becomes still, low, hard or unable to disengage.
Example in context
Two dogs approach in curves with loose tails, sniff briefly and separate. Pulling them back together for a longer hello removes a successful natural ending.
When to ask for help
Use a qualified professional for tense greetings, lunging or past incidents. Tail pain or sudden movement changes need veterinary assessment.
Sources and limits
Blue Cross: why dogs wag their tails provides background for reading this pattern. A wag alone does not prove that an approach or interaction is welcome. This guide is an observation aid, not a diagnosis or a promise that every dog uses the signal in the same way.