I just discovered that it was possible to subtract stats. Refunded points or not, is this intentional? I'm naturally reluctant to lower anything else in case it wasn't.

What concerns me the most is how it seems to affect all the stats, including level- or at least you can make it go to -1 and beyond in the same way. Doesn't that determine training cost and time?

It shouldn't actually be possible to lower stats through that page. Whenever I try to hit the down arrow to go to -1, it jumps back to zero. Same when I try to manually enter the -1 or -10 or something, it doesn't let me keep it that way.

If it did somehow let you subtract stats from your pet through that page, I would post in Problems & Bugs and maybe even file a ticket, because that's not the intended way that page is supposed to work. It's for adding stats only, and stats are meant to be removed through stat leeches (if you want to remove any).

As says you shouldn't be able to reduce stats on that particular page.

You can lower stats though, in addition to the leaches mentioned, if you kick the training vending machine, you need to have a boot in your inventory and your stats can go up or down. I think it affects a random pet a random amount of points.

You can also buy certain potions/stat buffers that may raise or lower certain stats.

For example the , goes from -2 up to +5 for level, strength, defense, speed and health.