When you have a pet dog, it is necessary to care for it carefully. The most i______ part of dog-care is cleanliness. Not only does the dog have to be kept clean, _______ his environment should be clean. The bed   it sleeps _______can be made with a carpet. Proper feeding is also important to your dog’s h_______(健康) . A dog should be fed in the same place and on a ________(有规律的) schedule. Food should never be left before a dog for o_______ thirty minutes. Remember to keep fresh water available during hot weather. A______ important thing many dog owners forget is exercise for their dogs. ______(积极的) exercise helps build    strength and keeps the dog healthy. W______ the dog at a fixed time the of day is enough to help the dog live a healthier and h_______ life.