Instruct: Classify Amazon reviews into positive or negative sentiment
Query: not durable

It worked ok for the first few days after we got it for our dog to play and walk in the snow and on the pavement with snow/salt.We realized that these boots are extremely hard to clean by hand. The salt and sand get stuck on the bottom of the boots because the bottom of the boots are not smooth. They feel like suede/fabric. Unless you toss them in the washing machine after every use, it is very hard to maintain them and dry them.After using for a few weeks, the bottom of the boots began to break. There are holes on the bottom towards the front of the boots (we do keep his nails clipped frequently). They are no longer waterproof anymore. The company's website stated that "many dogs have worn their Muttluks for over three years", but it only lasted just over a month for our dog. We never use them on dry pavement or concrete. We only use them to protect his feet from salt when there's snow.The boots are also not very easy to put on. It takes us about 10 min to put all of them on the dog.