As I have noted in the past, the vast majority of funds raised through direct mail by the Humane Society of the U.S. is spent on sending out more direct mail. Almost all the rest is centered on attacking farming. Not a dime goes to directly helping shelter animals.
This is not to say that HSUS does not do some things that have some value.
It is to say, however, that donating to HSUS is a stupid way to help animals -- the financial equivalent of heating up your coffee by burning a $100 bill.
By the way, I am not a huge fan of Humanewatch, either. This is an "astro-turf" group created by a fellow that has found his niche here in Washington, D.C. by running attack campaigns on behalf of ethically bankrupt industries. And yes, that includes fast food restaurants, the meat industry, the alcohol industry, the tobacco industry, and the gun industry.
Flim-flam men to the left of me and apologists for collateral killers on the right. What a town I live in, eh!?