Instruct: Classify Amazon reviews into positive or negative sentiment
Query: For Small Dogs only.

Bought this item for 45lb dog to keep her away from back door. This item did not work with a dog this big. I was told by customer service that it works for his small dogs in the house...after I bought it. I don't remember anywhere in description were it gave a weight limit. Like I said, probably good for smaller dogs, but not one my size.