Appreciate the gotcha, nearly as fun to post as pedantry. I only made the same mistake OP did, however.
The actual point still stands. If you're going to take a dig at a legal system, country, or culture, don't try to back up your point with an example from a different one.
Scotland is not England legally or culturally, and the scots will be the first to make that point clear.
Sure, although this does feel like it's becoming painfully drawn out. Let's use a simple parallel example: If someone's having a laugh at, say, Trump. Then they use that as an example of how those those silly Canadians are always electing daft politicians. You're probably going to point out that Trump was not in fact the president of Canada. That the example is not relevant.
Likewise, it is a mistake to lump the Nazi dog case in with the other case. One occurred under Scottish legal jurisdiction, the other under English legal jurisdiction. The example is not relevant.
Scotland is a part of Britain. Scotland is not part of England nor Wales, but Scotland, England, and Wales are all part of (Great) Britain.