How this actually works
Two numbers come out the other end: a Pettability score, how good an idea this is, and a Bite Risk score, how likely it ends badly. Where you are matters more than anything else, because street dogs and leashed pets are answering a completely different question. A dog in South America or Asia is statistically more likely to be living semi-independently, reading you on its own terms, than a golden retriever on a leash in a Berlin park. That's not a judgment on the place, it's just how stray dog populations work.
Everything after location is about reading the actual dog in front of you: leash status, whether the owner looks relaxed, what the tail is doing, and an overall energy dial that runs from "meditating monk" to "cryptid behavior." Holding food nudges the odds up and the risk up at the same time, because bribery works but also escalates things. A dog in a sweater gets a flat bonus to everything, because that is simply how the universe is structured.
Pick Antarctica and the calculator short-circuits entirely. Dogs have been banned from the continent since 1994 under the Environmental Protocol to the Antarctic Treaty, specifically to stop canine distemper from spreading to the seal population. If you are looking at a dog in Antarctica, this calculator is not your most pressing problem.
Should you actually trust the result?
No. This is a joke calculator on a website called Useless Calculators. Reading a dog's body language is a real skill and a slider can't replace it. If a dog looks tense, is growling, or the owner says no, the answer is no, regardless of what this page tells you.