I'm a goner at shelters, too. The first time we visited the Denver Dumb Friends Leage, we came home with a cat.

Adding a second dog does create more work, but it's worth it for sure. It's so fun to see your dogs interact and play together, plus you have another companion to love. Just make sure you read up on pack heirarchy and understand the dynamics that will take place.

Good luck at the SPCA.