The Instagram photo shows the young animal squeezing its head through two seats.
The snap was taken by a flier in the seat behind.
In the shot, the dog’s face is compressed as it forces its way between the headrests.
Its snout pokes all the way while its cheeks and eyes are crinkled from the seats pressing against them.
It is probable the hound is a service animal who is being trained.
The UK’s Civil Aviation Authority (CAA) explains the rules for such pets on its website: “Airlines must accept all assistance dogs for air travel without charge.
“Dogs will normally sit in the space on the floor in front of the seat (many airlines will seat passengers with guide dogs in the front row, if possible, where there is usually a little more space).”
However, the rules on emotional support animals are different in other countries – and it is not known on which airline this photo was taken.
“I would love a companion like that on a flight,” another added.
One person imagined what it would be like from the dog’s point of view, writing: “Excuse me, sir, can you please stop kicking my seat and pet me?”
Another revealed to what extent they’d go for such a companion.
“I would pay extra for this,” they penned.