… what should I buy for a Westie? …
There is special dog fence systems for small dogs, the Petsafe Little Dog Fence (PIG00-10773) (see our review here). The collar is about half the size of a regular collar and they have a lower correction level. But, you can use most systems with a small dog. The adjustable collars you find with most sets will fit small dogs. For example, the Innotek SD-4100 (review here) has a minimum circumference of 10 inches and has a low correction setting that will work just fine on a small dog.
That said the Petsafe Little Dog Fence (PIG00-10773) is probably going to be marginally more comfortable for a small dog because the box that hangs off it is about half the size. If you can live with the lack of rechargable battery, we would buy with the Petsafe. Otherwise go with our favorite the Innotek SD-4100.
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