All true, but it’s even worse: sometimes some of the cited facts are plainly wrong. Taking your example, it could be that the midwest actually has the same heart disease statistics as anywhere else. Just because someone told you something confidently doesn’t mean it’s true. “95% of statistics is made up on the spot”.
So maybe “dogs have a much shorter digestive tract” is already wrong? Maybe they have roughly the same length as us? And maybe “[things with parasites] have a much smaller chance of making a dog sick than they do humans” is also wrong? If you care about the truthfulness, you’d have to look that up too. And then you’d have to find that there’s causation between the two.
But all that said, I agree with another reply: “It’s a really low-risk bit of information, whether true or false. […] there’s no harm in taking in low-stakes stuff”. So no need to be paranoid about every little tidbit of info, just the things that matter to you.