Instruct: Classify a review into positive or negative sentiment.
Query: Not for my horses

I recently bought Defy the Fly for our horses. I got the smaller size collar and found it large for even the 16.2h gelding. It definitely smells like it would repel flies but he had it off within a few days. I found it ripped, not unsnapped and lying on the ground. This product may work fine if you get a good fit and it stays on. I won't be buying anymore.