Our local Humane Society often requests cleaning supplies as well as towels and paper products. They also can always use cash! They are having a fundraiser this weekend which involves pet photos with Santa. We may have to take Henry to that.
Another good idea is collars and leashes. We purchased inexpensive collars and leashes at the dollar store after Hurricane Katrina because our Humane Society took several truckloads of donations to that area and that was the main thing that they requested other than food.
Our Humane Society has gotten a grant from PetSmart for a really neat new program. PetSmart is funding heartworm treatment for 100 dogs (who would otherwise have to be put down) and the Humane Society is looking for volunteers to provide foster homes for the dogs while they recover from their treatment. The dogs have to be crated almost all of the time for about 6 weeks. I wish we could take one in. Henry would be fine with it, but Simon is old and grouchy and doesn't really like other dogs. He's also had enough medical problems of his own lately.
Happy Holidays to you and your furry friends!