Golden Retriever

These lovable dogs are great for a house pet. Historically developed they were bred to have a soft mouth to retrieve game undamaged and have an instinctive love for water. They are very intelligent and versatile making it easy for them to do a number of things.
They can detect illegal drugs,search and rescue,they can be used for hunting,guide dogs and are the most popular as far as being a great family dog(by registration)in the world. Their eager demeanor and friendly attitude makes them pleasant to have around in almost any situation. Although with their kindness,trusting and gentle disposition they are not very good at being guard dogs.
The typical Golden Retriever is calm, naturally intelligent and biddable, with an exceptional eagerness to please.
Golden Retrievers have been known for their intelligence ranking #4 by Stanely Coren's The Intelligence of dogs. They are one of the brightest dogs ranked by obedience command and trainability. These dogs are also renowned for their patience with children.
Adult Golden Retrievers love to work, and have a keen ability to focus on a given task. They will seemingly work until collapse, so you should take care and avoid overworking them.
When these dogs reach maturity they will be active and fun-loving animals with exceptional patience and can be trusted if trained correctly to sit quietly for hours in a hunting blind.

The original cross was in Scotland at at "Guisachan" of a yellow-colored Retriever and a Tweed Water Spaniel but unfortunately the Tweed Water Spaniel's are now extinct.
Golden Retrievers were first accepted for registration by the Golden Kennel Club of England in 1903.
Then in 1913, the Golden Retriever Club was founded.
In 1920 the name "Golden Retriever" was finally made official.
They are also known to become excellent surrogate mothers to different species. Kittens and even tiger cubs from zoos are well taken care of by golden retrievers. In some cases, a retriever may produce milk for its adopted even though it may not have been pregnant or nursing recently.
They do very well in small living areas of at least 500 sq. feet.While the breed is recognized for its vitality, many retrievers are susceptible to specific ailments. A responsible breeder will proactively minimize the risk of illness by having the health of dogs in breeding pairs professionally assessed and selected on the basis of complementary traits.
Hip Dysplasia is very common with the Golden Retriever.
The first three dogs ever to achieve the AKC Obedience Champion title were Golden Retrievers.
All in all I would definitely recommend buying a Golden Retriever for you and your family.

Greyhound

Greyhounds are known for their speed and agility hence the greyhound bus Co. They are excellent race dogs. They are also good at hunting, sighting, and being watchdogs. Flexible spines that are curved with long sleek bodies. They have dark eyes and small ears that fold back. Greyhounds can run as fast as 40-45 (70 km) miles per hour! They have smooth coats that vary in colors black, white, gray, red, fawn, fallow, brindle, and blue. Short fine coats that are easy to groom combing at least once a week. Rub down it's coat with a chamois cloth to give it an added gleam. Their skin is very sensitive and tears easily so you may want to check with your veterinarian before using flea-killing products on your pet.

Greyhounds are gentle, sensitive, loyal, and brave animals. Great with children and are very obedient. When in public places it's probably a good idea to keep your greyhound on a leash for they are usually tempted to chase things. Easy to train but you do not have to be firm with the greyhound for it to learn. A gentle approach is the best way.
The best way to feed the greyhound is two small meals a day, rather than one very large meal.
Greyhounds are usually prone to bloating and are sensitive to drugs and insecticides.
They may also be allergic to certain anesthetics. Greyhounds are one of the few breeds that typically do not suffer from hip dysplasia. The life expectancy is usually about 10-12 years.
This breed most likely descended from the Middle East or Europe and was noted as an excellent hunting dog.