Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not too happy

After reading the good reviews for this item, I thought it would be perfect for my unfenced yard. I purposely purchased the "Stubborn Dog" fence for my rottweiler puppy figuring he was probably going to be a handful when he got older. Turns out he's already a handful - not only was he running through our underground fence at 8 months old, he was also running through my next door neighbor's fence (also the PetSafe Stubborn Dog). I guess we'll just leave the wiring in for now, but I doubt we'll ever be able to use it again. It sounds like the fencing works with other types of dogs, just not the big stubborn ones.