how to catch a loose dog

This is my first post on reddit, sorry if its long etc, but I'm trying to figure out how to catch this dog.. (tldr at bottom)

Im in Kunia and the past owner of these two dogs can no longer take care of them. There are two pitt mixes, a female and male, I believe they're related in some way (mother/son or sister/brother). They both ended up getting loose but luckily the girl is very sweet so I was able to leash her but the boy is very skittish and won’t let me get too close without running away. He seems very bonded to the girl so he sticks around.

I built them dog houses, feed and water them twice a day, but I'm in no place to take in two dogs myself. I've called shelters and the Humane Society and they said I could drop them off or they could pick them up, but only if they are already caught/contained.

I'm worried if I only surrender the girl, the boy will take off... is there anyone I could call to try and catch or trap him? Or any tips on how to do it myself?

TLDR: Is there anyone I could call to catch a loose dog? Or how do I do it myself?