We use them for our Whippet - but that's because a regular collar will just slip right over his skinny head!
If your dogs aren't pulling and are fine on a collar it really isn't much different. If they are going to be pulling I probably wouldn't use it (but I wouldn't use a collar in the circumstance either).
I know that Angelynn makes some great collars (Tickled Pink) and comes highly recommended. If you want to look at some good martingale collars check out the ones for Italian Greyhounds - they'd be small and nice.
If your dogs aren't pulling and are fine on a collar it really isn't much different. If they are going to be pulling I probably wouldn't use it (but I wouldn't use a collar in the circumstance either).
I know that Angelynn makes some great collars (Tickled Pink) and comes highly recommended. If you want to look at some good martingale collars check out the ones for Italian Greyhounds - they'd be small and nice.