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I used to have a Maine coon named Fluffly.
One day the neighbor’s female German Sheperd wandered into my yard.
Fluffy could NOT abide this development, arched her back, with her
considerable mass of hair standing on end, and took off like a bullet
toward Gina (the sheperd), the dog stopped paralyzed by this thing
headed straight for her. I could almost hear the dog think: “What the devil IS that thing?”.
Then the dog turned tail and ran back to her own yard. Cat followed
but stopped at the fence around the dog’s yard. Stood there glaring and
yowling at Gina.
Fluffy was just a tad territorial when it came to defending her ‘turf’.