what percentage of familes owns a pet?

the pet can be a bird, dog, cat or any other animal. percentages or fractions will work fine.
Answers:
According to the APPMA (American Pet Products Manufacturers Association):

63% of U.S. households own a pet, which equates to 69.1 million homes.

45% of U.S. households own more than one pet.

Bird - 6.4 million households
Cat - 37.7 million households
Dog - 43.5 million households
Equine - 4.2 million households
Freshwater Fish - 13.9 million households
Saltwater Fish - .8 million households
Reptile - 4.4 million households
Small Animal - 5.7 million households

In 1988, the first year the survey was conducted, 56% of U.S. households owned a pet as compared to the 63% of present day

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I'd guess that the percentage is pretty high these days. I myself have four pets. Two cats and Two Dogs.. I'd say probably 1 out of every 3 families have at least one pet..