I would get an add on Flash & bounce it off the ceiling It gives a more natural picture anyway. Also Open up all of you blinds & certains & use the natural sunlight Shut off the flash.
I try & not use the flash to much on them since it's so bright it can't be good for there eye's.
here's a picture of Brownie When using the add on flash.
http://www.flickr.com/photos/41183440@N04/3991008278/