Try this thread for some ideas:
Black cats are hard...not enough light, and you get a big blob, too much light and they wash out. I'm interested to hear ideas, as I'm in the process of retaking lots of the black cats' pictures, and it's hard to get good pictures that don't all look the same.
If you have an adjustable flash, you can try bouncing it off a white ceiling or wall to get more light without the glare. Use a tripod or brace, because any movement at all really muddies up pictures of black cats (especially in low light). If you are using digital, use the absolute highest quality setting you can, as you'll end up with more color depth and better detail.
The last really good black cat picture I took (digital) was a super-long exposure (3-4 seconds, using a tripod) at 100 ISO (or so, digital is strange that way) with ambient light (flourescent) and no flash....(bear in mind, this is a thumbnail copy of the original, which was 1600x1200)
The color cast was all wrong, but I corrected it with graphics software and it ended up looking okay in the end. I have much less luck with wiggly black cats, though...one black and white kitten has been confounding me for weeks, and I just can't seem to get a decent picture of him.
I swear he's laughing at me...
Torties drive me nuts, as well...it's so hard to pull out those pretty color variations...this is the best luck I've yet had:
I get so excited when orange kitties come in, because it means I'm almost guaranteed to get some good, vibrant pictures that week, ones that don't need to be heavily enhanced. I need to get out more, I think...