The way dogs communicate what they are thinking or feeling is through physical actions and cues.
When you see the dog with head hanging low and the tail between the legs it is displaying an apology.
When the dog knows that you are upset with it and you shout it will tuck its tail between the legs feeling nervous, venerable, shameful, embarrassed and submissive for doing something wrong or the dog is frightened that the owner is going to hurt it.
The dog will lower it's tail or might even tuck it between his rear legs if it feels nervous in a new environment or if there is a stranger near by.
If the dog is scared, it will hold its tail tight against its belly. This is a position the dog takes around a dominant animal or person.
Both female and male dogs tuck their tails to signify submission.
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