There have been plenty of good posts about dyeing fur with acrylics before;http://fursuit.livejournal.com/tag/dyeing
..but I thought I'd share my experience too.
I need light yellow fur and have DF ivory, so I mixed yellow acrylics with cold water, and did some test pieces. It worked out better than I thought! I expected the paint to hold on far less well, and the test pieces turned out far more yellow than I actually planned. (the two times I dyed before were fabric dye onto fur, and acrylics unto fleece, neither held on very well though they did their job) Next time I'll just use less paint, I guess.
I had two test pieces, one left drying flat, and one hanging in front of a fan. With both pieces I combed one half while drying and left the other untouched. All four techniques work fine, the fur is still surprisingly fluffy, it feels pretty much as soft as it did before.
The fur that was left hanging has more or less of a gradient, because the paint runs down to the bottom. I'm not sure how this would work out with a larger piece, either there would be a gradient all over the fur but I suspect only the bottom ridge would be very saturated.
Combing didn't make much of a difference for the fur texture, after drying the non-combed fur was scruffy and hard but after a good brushing it was just as fluffy as the combed part. A difference though is that the combed part has the paint more spread all over the fur and seems far more saturated in color. The uncombed part has more color on the tips, and the undercoat has less color to it. It looks really nice but I wouldn't recommend it if you need to trim the fur.http://lindyandhop.tumblr.com/post/7927754099/fur-dyeing-tests-with-watered-down-acrylics-ivory
Photos can be seen here! (though as always, the color is off in the photos)
This test was meant for a big fur piece which I still need to dye, I'll show how that turned out here for sure! As said before, you can follow the entire progress for the suits we're building on that blog.