The cheapest dog breed in the world is the English terrier, which can be bought for around $100.
However, it’s important to consider the ongoing costs of any dog. For example, a pug puppy may typically cost only $350, and won’t cost a lot to feed, but lifetime veterinary costs for this breed are likely to be high.
Also, keep in mind that adopting a dog is usually cheaper than buying one from a breeder or pet shop.