The thing about dogs is that they don't damage you by puncturing. They try to grab onto your body parts and tear your flesh out by moving their head furiously. In that regard PSI can be a useful metric as it describes how hard it will be to open their jaws.
Your story sounds interesting. I never even thought about learning the underlying science. How do you even find this information?
Okay, this is excellent. Truly a masterpiece of our time.
Hello! Do you have a remote estimate of the amount of photos you're planning to include in the slideshow? I would have personally used an s3 cloud solution for something like this. AWS, as far as I know, has a free tier which is limited to 5gb, but even if you exceed that, the prices are pretty liberal, especially for smaller applications and you only pay for what you actually use (storage + request) so I advise you to atleast have a look. You can get an estimate of what you'll pay here. P.S. I am not a native speaker, so sorry for bad grammar :)