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A dog.

A dog can give 15 or 20 years of faithful service, but if it goes wrong it can be expensive to repair in terms of vet's bills. Many faults are the result of poor initial set-up, which can only be corrected by a skilled dog trainer. Good maintenance requires daily walks and much attention, all of which can be time consuming. Regular pat testing gives good results. Whilst keeping a dog can be very rewarding, many people prefer a cat, which is largely self-maintaining, only requiring regular food and a warm lap on which to dry itself when it's been out in the rain.