Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Be careful of the size... but a good buy!

The kong is definitely my puppy's favorite toy to play with. We stuff it with some natural peanutbutter and he loves it. Be careful of the size you buy. We have a 8 month lab/aussie shephard mix and the medium was too small. It worked well for my sisters small shih tzu though. We ordered the bigger size for our mix, and it worked really well.