It came about because, in her impressionable youth, she encountered a mystery infestation of newly-hatched blowflies in our house and thought it great fun to chase them and eat them.
Disgusting, I know. But dogs don't seem to understand the concept of disgust. (And, from reading the article I've just linked to, no-one completely understands the function of disgust in human psychology.)
Anyway, back to blowflies. (I hope your sense of disgust hasn't kicked in so strongly that you've already clicked away from this post.)
One of Penny's humans reported that she was 'licking the front window'. That seemed so strange that I jumped up from the computer, where I was reporting on our walk to Fairfield Boathouse this morning, and went to check it out.
Frenzied buzzing explained it all. A fly was caught in a spider web at the side of the window where Penny keeps an eye on the street.
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'Leave it! I snapped. Too late. She'd pinched the spider's lunch. And the little spider, about the size of a fly itself, was coming out to see what the problem was.
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You can't live in Australia without co-existing amicably with spiders, but the thought of the spider biting Penny on the mouth or nose had me worried. So Penny had to go into prison behind a baby gate while I chased the spider up and down the narrow rim of the window with a folded-up Woolworths receipt.
Success! The spider is out in a nice little pile of empty plant pots, and Penny is back at the window.
I just hope the fly went down without causing any stomach problems!