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If you already have a dog, there's a good chance it's responsible for the smell in the first place...

> what's a good way to find the source?

Binary search.

I use computer algorithms in many non-computing tasks.

Doesn't work too well when your comparison function is faulty, in particular olfactory fatigue.

Linear search works much worse with olfactory fatigue.

Rat poison will be the source in many cases