For many centuries, dogs and humans have had a symbiotic relationship;
(I)
humans have enjoyed the companionship and loyalty that dogs provide, and
dogs have enjoyed the care and protection that humans offer. Dogs, however,
have been used for more than companionship. For instance, dogs' abilities
make them natural hunters. Their sharp eyesight proves useful in spotting
prey and their excellent sense of smell is a valuable too] for hunting. In
addition to hunting, a dog's strength and endurance is useful to humans; larger
breeds are commonly used as working dogs, primarily for herding animals on
farms or carrying heavy loads, such as wood. Also, it is common for
vision-impaired persons to employ more intelligent and early maturing breeds
as guide dogs. The many services that dogs provide people have made this
animal an invaluable part of human society
Although dogs possess many useful
breeding dogs to improve their natural
example of selective breeding in which
mating based on the length of their no
noses
Although the offspring of the breeding
become an effective hunter, the pup's advanced
in becoming a skilled hunting or sniffer do
improve on a dog's specific character, size,
selective breeding, for instance, bull dogs
than previous types of this dog, and
one-colored coats whereas multicolored c
Over time, selective breeding has been a
advantageous
consequence, many of the dog breeds that
this process.
(3)
Nevertheless, selective breeding has
have used selective breeding in order to create larger, stronger and fiercer
breeds to serve as guard or fighting dogs. For instance, the pit bull was bred
for its strength and agility in order to hold down bulls in fighting rings.
Although the practice of bull-baiting is banned in most countries, this breed
(4)
continues to live today, often as a family pet. Many people believe this type of
dog is dangerous to humans due to its selectively bred characteristics, and as a