Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to use a hamster ball [title] Learn about the risks of hamster balls. [step] While hamster balls are extremely popular, many people are critical of hamster balls because of the potential risks they pose to our small furry hamster friends. Before buying a hamster ball, you need to learn about and consider the numerous risks these popular toys can pose to your friend.

Ending1: [substeps] Hamster balls can create unneeded stress and anxiety for your furry friend. If not used right, hamster balls can present physical dangers to your small friend. Ending2: [substeps] Hamsters generally prevent good health from deteriorating by being completely protected from nematodes. Mice are considered capable of dying because of their small size. Ending3: [substeps] Baby mice, mice dust, rats can lead to an enlarged belly, while human mice will expose their teeth to take care of their problem. Adult mice will also be more likely to develop and be more aggressive towards younger mice. Ending4: [substeps] You can purchase hamster balls online. Some sites like maplemedia allow small dogs to play with the hamster ball in their homes.

Answer format: ending1/ending2/ending3/ending4