Dogs

In my experience descriptions of events (like the one in the article) are less likely to be false than absolute certainty general statements about things always/never happening (such as "they absolutely don’t reward these dogs for mistakes").

This is mainly because the absolute certainty general statements are pure opinion worded as fact (i.e. with no actual study or similar to back that assertion that something always or never happens) hence usually bollocks, whilst somebody describing an event would have to willingly, explicitly and activelly be lying for it to be false.

So purelly from the way you worded things, that random tweet is already way more believable than your post.

Then beyond that, what's described in that post is the handler being nice to the dog for their quirky behaviour, which doesn't at sound far fetched - I've often seen people unthinkingly reinforcing a dog's negative behaviour because "it's cute" - people like dogs and often end up doing dumb things with them because they like them, which is how you end up with dogs which are too fat (which is bad for the dog) because that dog is smart and good at begging for food.

I'm not even saying that the poster you replied to claiming that handlers were purposefully mistraning the dogs was right (frankly I have no idea as, like you, they just voice opinion as fact), I'm saying that the way you tried to counter argument that post is even more bullshit than that post and now you just doubled down of scoring own goals by claiming the tweet itself is possibly a lie.