Does it stain pillows at night?

I use it on a grey patch on the back of my head and find it does stain my pillow over time as well as the collars of my shirts, but it does wash out ok.

Does this come off on to fingers if touched and on bed sheets for example? Asking for my wife!!

No, you won't get any mess from this product. Once it goes on to your hair it fixes quickly and will only come out with shampooing. And your wife will only get it on her fingers if she touches it - after which she can brush or rinse it off. It won't cause any staining, and it won't run if she gets her hair wet. For my part, I use this product to tide me over between hair appointments. I use it to touch up the grey gap in my parting, and it works brilliantly for that, easily tiding me over one or two weeks, and genuinely no one would guess it was a touch up job. It is the easiest product to use. Color Wow do a couple of YouTube demonstrations - it is exactly as they say.

Does the packaging give any information about whether the ingredients contain any animal products and if it is tested on animals, please?

I don't think it said on packaging but on their website it states it is not tested on animals and contains no animal-derived ingredients. hope that helps