Sweetest Pup, tell me what to do to help him!

We just moved here and our neighborhood has at least 4 strays. This baby was so cold it was willing to come in my garage last night. I have a big dog who just will not let another dog in the house. (We’ve tried training and he’s a work in progress) I tried setting an appointment with the Animal Defense League and they’re full. I’ve posted on every social media and lost dog page I could find. Can someone please help him. He’s the sweetest and wants nothing but pets and attention. For now he’s in my garage with a blanket but I can’t keep my garage door open with the temps dropping. Please help!