What the research actually says
Behavioral researchers describe two main categories of canine sighing. The first is a physiological reset — the body finishing a stress cycle and dropping into parasympathetic rest. The second is what behaviorists call a 'contentment vocalization.' Dogs sigh when they are relaxed, settled, and — and this is the part that always gets me — usually within sight of their person.
Half-closed eyes
Watch the sigh next time. The eyes are usually half-closed. The body is loose. The tail is still. This is a dog telling you, in the only language she has, that she feels safe.
The sigh as a small confession
We don't usually think of our dogs as having interior lives. We talk about them as if they're simple — food, walk, ball, sleep. The sigh complicates that. The sigh is a small, audible confession that the day was good, that the person on the couch is the right person, and that for now, everything is in its place.
Pay attention to the next one. It's the closest thing to a love letter your dog will ever write.
