Brian Tri Tronics has always been my choice for collars. They have been bought by Garmin and I think this has been a great blend of companies as far as Electronis collars. For about 5 years have used the Astro and then the updated Alpha 100. Now there are improvements including a recently announced smaller collar which might be perfect for your dog. The Alpha 100 combines everything in one unit. All of the regular stuff with the benefit of GPS tracking. PM me I can give you more info as it relates to my hands on experience. Best money I have spent in a long time. Ours get used multiple times a week and are virtually trouble free.
