What are the best features to look for in a guinea pig cage with a pull-out tray?

When looking for a guinea pig cage with a pull-out tray, the best features to consider are size, ventilation, ease of cleaning, and durability. A spacious cage allows for ample room for your guinea pig to move around, while good ventilation helps maintain air quality. A pull-out tray makes cleaning easier and more convenient, and a durable construction ensures the cage will last a long time.