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1·Teeth can give a rough indication of a dog's age.

通过牙齿可以粗略地推算狗的年龄。

2·Be sure that protein ratios are appropriate for your dog's breed and age. Typically, dog food with 20 to 30 percent protein content provides a healthy balance.

确定给您的狗食物中有适合他品种和年龄的蛋白质含量。一般说来，狗狗食物含有20 - 30%的蛋白质含量就能够满足健康狗狗的需要了。

3·Select a high-quality dog food that's appropriate for your dog's age, weight, activity level or size.

按照狗的年龄，体重，活跃性和大小选择高品质狗粮。