To start, wolf hybrids are a cross between a domesticated dog and a wolf — which is rarely a product of nature. While the two species can interbreed in the wild, this seldom occurs. All wolf dogs available for adoption or purchase come from selective breeding.
Unlike many species, intraspecies crosses usually result in fertile offspring. This means wolf hybrids can come from breeding a wolf and a dog, a wolf with a hybrid, a dog with a hybrid or two hybrids.
Wolf dogs might look similar to domesticated dogs, but there are visible hints to their wild roots. Hybrids have a bigger head-to-body ratio, round-tipped ears, yellow, green or amber eyes, and signature cheek tufts. They also have a narrower rib cage and back with a long, straight, bushy tail.
Basically, since wolves are the product of evolution rather than selective breeding, their physical characteristics are adapted for life in the wild rather than cuteness. They usually have a more athletic, muscular appearance for the same reason.