There are seven different groups of dogs:
Herding
A collie is a herding dog. Herding dogs are dogs that love to be out in the field herding sheep and/or goats. I would have a herding dog because when I grow up I would like to live on a farm with lots of animals.
Hounds
A beagle is a type of a hound. Hounds do a lot of sniffing. Sniffing for people, pets and sometimes bugs, but not usually. I might get a hound but I would get one that doesn't howl very much. Because beagles howl like "Howoooo, arrhoooo, arrrhooo".
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Non-sporting
A Boston Terrier is a non-sporting dog. Even though the group name is non-sporting, you still have to play games with it and such.
Sporting
Sporting dogs are very active as their name implies. You can play fetch, catch, chase and race.
Terriers
Terriers are on the small side for dogs. But there are some that get big. I would own a terrier, but I like other types of dogs better.
Toy
An example of a toy dog is a miniature pinscher (aka minpin). I love saying minpin. Toy dogs think they are a lot bigger than they are. So they take on big dogs with a "You want a piece of me!"
Working
This is an Akita dog. Working dogs are usually big dogs. BIG dogs. Some working dog jobs are: search and rescue, pulling, and some more.