MawBroonsback ,
If you never set foot outside in those shoes they'll be fine. The pavement outside, your drive and doorstep are likely to be contaminated by particles of dog, cat, fox and bird poo, spread everywhere by shoes, cars, animal feet, rain and wind
What are you on about?
But Lessismore, what does owning a dog have to do with it?
Hetty58 who are you to say what I may or may not be in contact with locally from walking (surprise, surprise) on pavements, footpaths or grass?
Never heard of welly boots for muddy fields or long walks?
Added to which there may be foxes who pass through my garden, along with the hedgehogs, cats and squirrels which enliven Hattie’s day.
In addition to which I like most people, do change my shoes when I come in, it’s more or less a given in the country.
But I am mystified by your chain of reasoning, if there is one.
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