What is the point of controversy about the dogs?

Lomov claims that his dog Guess is the first-rate dog. He says that Natalya's dog. Squeezer is overshot. He says that Squeezer is a bad hunter and its lower jaw is shorter than the upper jaw. On the other hand, Natalya says that Squeezer is better than Guess as Squeezer has a better pedigree. She says that Squeezer is a thoroughbred animal, and Guess is old and as ugly as a worn-out cab horse.