Ideas to rescue if you don't have time/space to rescue on your own:
1.Offer to cover the cost to spay/neuter one or more dogs
2. Send food to people who do rescue.
3. Be vocal about spay/neuter any time pets come up in conversation
4.Visit a classroom once a month with pet education materials
5.Make sure your own animals are well behaved, well cared for, spayed and neutered and generally great ambassadors for happy, well balanced dogs.
First walk the walk, then talk the talk.
I just had a big idea-I'm going to ask Petco, Petsmart-to give discounts to spayed/neutered animals.....I'll have to work the bugs out of the idea, but I am going to pursue it today.