The pet thing is a bug. I thought they were working on a fix for that.... can't recall if it was supposed to be in the last publish or the next one... but THAT is a bug.....
As for them seeing you around mountians, three and 4 screens away threw walls, above/below floors and anything else where you are "Unable" to see or reach them by spell or by shot that has ALWAYS been and I almost recall them saying that is as intended..... they are monsters and apparently they have X-ray vision and super hearing. So while we can't do anything about them they can sure agro on us. I'm pretty sure I recall one of the Dev's saying something to that effect a few years back. And monsters have a MUCH, MUCH bigger range than we do both spell wise and shot wise as I know I've been shot by a Juka Lord from 2 screens or more away.... guarantee it's much much further than the 10 tiles I get with the same bow.
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Please click my egg/hatchling and help my dragon grow! Bel'la Dos (Thank You)