I love dogs! they were the first species to be domesticated and has been selectively bred for over a millennia
Dogs are great! They have been man's best friend for a very long time!
Exactly! The good thing about dogs is they vary in shape, color, size and even behaviour
Yeah they vary from the toy breeds to the huge St. Bernard. There is a dog for everyone!
I love pugs! but i would feel bad owning one due to there poor health. I like how dogs can perform many roles for people, like hunting, herding, protection, assisting police etc.  
That is true. Sometimes the breeds have health problems that were unintended by the breeders. But the success stories are greater than the failures!
Thats a very good way of looking at it! It's no wonder that they are often referred to as "Man's best friend" 
I think of the dogs that help police find missing kids and the seeing eye dogs. We would not be the same without them!