A client describes their dog showing "whale eye" (sclera showing), with a closed, tense mouth and stiff body posture whenever a visitor tries to pet him. What is this dog most likely communicating?
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A
Playful excitement and anticipation of being pet.
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B
A relaxed state, simply observing the visitor.
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C
Deep sleepiness and being startled awake.
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D
Anxiety and discomfort, signaling a need for space.