According to Wikipedia yes, a brindle cairn.
http://en.wikipedia.org/wiki/Terry_(dog)
And a dark brindle could be pretty dark. From the ones I’ve seen at shows, I don’t think she was a very good example of the breed (from a show perspective) but then again, that was a long time ago and breeds change some over time.
BTW I didn’t know this, but it said that her foot was broken during filming and another dog was used for part of the film while she healed.
I’m sorry, that link seems bad and I can’t seem to get it to go directly to the page, but if you will click on the “did you mean Terry (dog)” it will take you to the page. Not sure why it will not post correctly, even tho I’m cutting and pasting. Phooey.
I don’t think I’ve ever seen a Cairn that dark, even at shows (been ages). Maybe it’s just the lighting!