There are about 52 (squared) pets in the world. Approximetly.
There are many, many pets that you can have. The most typical house-hold pets are: Dogs Cats Fish Birds Hamsters/Guinea Pigs/Gerbils
http://www.wowhead.com/?spells=-6 has a list of all the Non-Combat pets in WoW
As many as you want
Over 1000,0000 in the whole world and There are to much in the world
Probably, considering you can't really own a buffalo as a pet.
One can find a list of Penthouse Pets on Penthouse's official website, or in Wikipedia. YouTube also presents compilation videos bases on Penthouse Pets lists.
It is difficult to estimate the exact number of people who have hamsters worldwide, but they are one of the most popular small pets. Millions of households around the globe are likely to have at least one hamster as a pet.
Many travelers want to fly with their pets. The airlines have myriad rules for bringing Fido and Miss Kitty on that next flight. Check out this comprehensive list of the policies for carry-on and checked pets before you get to the airport.
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Yes many from different parts of the world
Nobody knows at all nobody in the world Knows I'm a kid
It is estimated that one hundred and fifty million people in the world have pets. This includes all types of pets, from goldfish and snakes, to cats, dogs, and horses.