This is where it started:

http://petoftheday.com/talk/showthre...5&page=1&pp=15

And this is from that thread:

Randi:
I'm a little unsure about its and it's. And is it "the animals' toys"? I think I tend to forget the apostophe.
RedHedd:
It's is a contraction for "it is;" the apostrophe stands in for the missing "i".
"The animals' toys" - the apostrophe is used to indicate possession. If there is more than one animal with the toys, it would be the plural animals' - only one animal, it would be the animal's toys.
Just to add to RedHedd's info:

One pet with many toys: "the animal's toys"
More than one pet with many toys: "the animals' toys"


Next: "lose" and "loose" for Randi