Did you know that your local SPCA or Humane Society is not financially supported from any national SPCA or Humane Society organization?
The ASPCA has commercials and advertising that reaches out on a nationwide scale, but they are not a parent organization to any local SPCA. Any donation you make to the ASPCA will not 'trickle down' to any other branch. The ASPCA, in fact, is the Manhattan branch of the SPCA.
This is not to say, or even imply, that they have been deceptive in any way. This is not to say that it is not a bad decision to donate to them. Quite the opposite, they provide law enforcement to animal-related issues in Manhattan as seen on Animal Planet's "Animal Precinct". Their Mission: Orange campaign reaches out to cities on both coasts. They offer pet insurance that is available nationally. They have provided valuable assistance in natural disasters like Hurricanes Katrina and Ike and were asked to provide expert assistance in the Michael Vick case. Indeed, they are an admirable organization worthy of supporting. Just understand that they are not tied in to your local SPCA in any way.
By the same token the Humane Society of the United States does not provide support for any local humane society. In fact, the HSUS does not own or operate ANY shelter.
If you wish to help your local animal shelter please give to them directly. Most rely solely on public donations.