There is no definite answer to the most valuable dog, because the value of a dog depends on many factors, including breed, bloodline, appearance, and health. conditions, market demand, etc. Some cross dogs may have higher value due to certain special characteristics or rare breed ancestry, but this is also affected by personal preference and market conditions.

Generally speaking, the price of purebred dogs is usually higher than that of cross-breed dogs because purebred dogs have pure bloodlines, conform to breed standards, and have more consistent appearance and personality traits. However, some cross dogs may have excellent appearance, personality or certain special skills due to the combination of the advantages of different breeds, and thus also have a high market value.