Instruct: Classify Amazon reviews into positive or negative sentiment
Query: No good for double-coated breeds -- eg, Keeshond or Samoyed

I had high hopes for this, as my keeshond is extremely vocal, but was simply unable to get it to deliver any kind of shock at all through his hair. He does have a particularly thick coat, but I tried parting it under the unit, and pulling the collar very very tight, but still nothing. Just in case it was the dog and not the hair, I tried it on a Samoyed, with much less of a ruff, but it didn't work on her either. I called the company, and they suggested shaving his neck, but I don't think they appreciated just what this would mean. Anyway, if anyone can recommend any way of keeping a keeshond quiet, please let me know.