We fount these statistics for 2008 on the website for the Humane Society of the US and found them very interesting.
Did you know?…
Dogs
* There are approximately 74.8 million owned dogs in the United States 
* Thirty-nine percent of U.S. households own at least one dog
* Most owners (63 percent) own one dog
* Twenty-five percent of owners own two dogs
* Twelve percent of owners own three or more dogs
* On average, owners have almost two dogs (1.7)
* The proportion of male to female dogs is even
* Ten percent of owned dogs were adopted from an animal shelter
* On average, dog owners spent $219 on veterinary visits (vaccine, well visits) annually
* Seventy-five percent of owned dogs are spayed or neutered
Cats
* There are approximately 88.3 million owned cats in the United States  
* Nearly 34 percent of U.S. households (or 38.4 million) own at least one cat
* Fifty-six percent of owners own more than one cat
* On average, owners have two cats (2.3)
* More female cats are owned than male cats (73 percent vs. 63 percent respectively)
* Eighteen percent of owned cats were adopted from an animal shelter
* Cat owners spent an average of $175 on routine veterinary visits
* Eighty-seven percent of owned cats are spayed or neutered
These statistics were compiled from the American Pet Products Manufacturers Association (APPMA) 2007-2008 National Pet Owners Survey.
We would really like to see that percentage of dogs and cats adopted from an animal shelter go way up.. So please when it comes to pets, ADOPT, don’t shop!