Why have huge felines advanced yet not enormous mutts?

Huge felines for the most part chase alone and depend on a short burst of speed to get their prey, and swipes from their hooks to cut it down. Wild canines chase in an unexpected way, utilizing collaboration to pursue prey over long separations until the point when it falls from weariness. A bigger body is a risk in this kind of continuance challenge – it requires more vitality to pull around and doesn't enhance the odds of a murder. 

We casually amass felines and puppies together on the grounds that we keep household renditions of them two as pets, however they are distinctive creatures that have developed to fit diverse specialties. Felines and puppies are both in the Carnivora arrange, yet their last regular predecessor lived around 42 million years prior. 

From that point forward they have wandered into feliforms (felines, hyenas and mongooses) and caniforms – a more different gathering that incorporates raccoons and walruses, and additionally canines. Bears are caniforms as well, and are more firmly identified with canines than felines are. So you could contend that enormous puppies do exist, and what might as well be called the tiger in the canine world is a mountain bear!