Smaller, less active breeds, cats or birds may be a better alternative.

小的，不太活泼的猫或鸟可能是更好的选择。

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Indoor pets, like birds or cats, don't require registration but cities want to keep track of dogs because they are more likely to go outside, where they can form wild packs and spread disease.

室内宠物，比如小鸟猫咪，不需要办证，但是市民希望给狗登记造册，因为他们更可能出现在户外，突然发狂或者传播疾病。

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Some raise small dogs or cats as their pets while others raise various birds or fishes as their pets.

有些人养小狗或猫作为宠物而有些人则饲养各种鸟类和鱼类为他们的宠物。

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