Considering the average dog walker charges $15 to $20 for a 20-minute walk, costs can add up quickly. Plenty of exercise is absolutely vital to a dog's health, but getting two or three walks a day can be tough when you have a full-time job. Cat toys are relatively cheap to buy and even cheaper (and easy) to DIY. Because dogs have a tendency to destroy their toys, they have to be made from much tougher (and much more expensive) materials-or replaced often. Once you own the pet, there are plenty of expenses you will have to incur, from supplies to caretakers. Some shelters may even waive their fees or offer a two-for-one deal on pairs of kittens. While buying a specific breed of cat can be expensive, generally, adoption fees are lower for kittens and cats than they are for puppies or dogs-particularly during kitten seasons or times when the shelter has a major influx of kittens. Over the course of their lifetimes, cats are generally more affordable than dogs.