Instruct: Classify the given Amazon review as either positive or negative.
Query: Not Worth the Cost or Hassle

First of all, if you have a long-haired dog (mine is a Cairn Terrier), you have to shave its neck regularly to get and maintain electrical conductivity for the shock. Next, the device activates only after three consecutive barks. Cairn Terriers, like many other breeds, are not stupid and quickly learn to bark in two bark sequences to avoid the shock. High pitched whining is not detected. They get shocked very infrequently, if at all. The device itself is not inexpensive and the proprietary batteries are a rip-off at ten dol*ars each - requiring replacement monthly. Google better replacement battery solutions and find out how to use generic batteries. The plastic collar gets brittle and breaks over time. It did work for about a month, then becomes a costly nuisance that gets tossed in the bad idea can.