See the white moon shape
in the bottom area
of  this boy's eye?
Note ridge under dog's eye.

The dog is also
looking away from the
person approaching him.
By this the dog is showing concern of someone or something entering his space and is also a
"calming signal" to the trespasser.

Another calming signal being given by this dog
is sitting. 

Ears are down and drawn back.

The dog is as far back
in the pen as he can go.
He is "Moving Into Pressure"  which is a term used to described a dog pushing against an object
or person.

The closed tense mouth is also a warning.

An anxious dog that has
nowhere to flee may
be forced to bite in
order to "defend himself"
from what he perceives
as a danger.
Signs Of Anxiety In A Dog
This dog is showing that he is uncomfortable with his surroundings.
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