Adult dog cannot hold it throughout the night…help!!!

Hello!

I recently rescued a 2 and 1/2 yr old golden doodle from a home that previously starved him. He’s a great boy, besides the fact we have some potty issues. He’s gotten better about peeing inside, but this is only if he’s taken out every 2 hours like clockwork. The first few nights I had him, he would sleep through the night from 11-7:30 no problem. However, around a week ago he’s started waking up 1-2 times every night whining. I take him out and he immediately pees and poops then comes back inside.

I’m not sure what to do because I take him out at 7:30am to pee, again at 9am to poop and pee, again at noon to pee, and so on. He is eating 3 meals a day to try to regain some weight, so he poops 5 times a day. Once as soon as he wakes up, after each meal, and right before bed. Still with all of these breaks, he wakes up without fail between 1-4am needing to go out.

I tried to crate him, and he peed immediately in his crate. If he doesn’t sleep in his crate, he’ll whine to let me know he needs to go out.

Any solutions for getting him to learn how to hold it? I’ve only had him for 2 weeks so is he maybe still settling in? I have a vet appointment today to rule out any medical issues, but I severely doubt it’s anything as he’s showing no symptoms.

EDIT: Vet said he is only a pound away from his ideal weight! Hooray!!! Due to this AWESOME news, we’ve decided to reduce the amount he’s being fed. Current theory is that he’s eating too much which is causing him to use the bathroom more (he eats raw or canned food so that plus his water bowl is A LOT of water intake for his little body.) he is 14 pounds now, but 9 when he was rescued!!! so happy!!! I’ll update in the morning if tonight runs smoothly, thanks for all the advice! 🙂