Oh Sue, Gaylord is so handsome!!!

I am not sure how territorial Killian and Shiloh are of their yard, so it may be a good idea to introduce them at the end of the block and have them walk home together. Or perhaps have them in the yard and then bring Gaylord in. You do not want Killian and Shiloh to come and see him in their yard. They may feel like their territory was violated. This is how it is with Drake. However, Drake won't let any dog inside the house yet

Be sure you have someone there to help you incase something goes wrong. And I would introduce them outside as opposed inside.