Why the reason not to get an old dog is actually the reason you should get an old dog

People say they can't get an older dog because it costs more money to look after than a younger dog.

But buying a young dog means you have to pay for them the rest of their life, including when their old. Or, in other words, you have to pay for an old dog on top of a young dog.

That is, getting an older dog is actually cheaper than getting a younger dog.

So the 'old dogs cost more' argument has a faulty premise, leading to a conclusion that's the direct opposite of what was intended. If someone wants a younger dog and not an older one, they should be truthful and own that decision.