Passage: The Australian Cattle Dog is a sturdy, muscular, compact dog that gives the impression of agility and strength. It has a broad skull that flattens to a definite stop between the eyes, with muscular cheeks and a medium-length, deep, powerful muzzle. The ears are pricked, small to medium in size and set wide apart, with a covering of hair on the inside. The eyes are oval and dark, with an alert, keen expression. The neck and shoulders are strong and muscular; the forelegs are straight and parallel; and the feet round and arched, with small, sturdy toes and nails.The Australian Cattle Dog breed standard states that it should have well-conditioned muscles, even when bred for companion or show purposes, and that its appearance should be symmetrical and balanced, with no individual part of the dog exaggerated. It should not look either delicate or cumbersome, as either characteristic limits the agility and endurance that is necessary for a working dog.

Question: What shape are the eyes?
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