You could just put the soiled puppy pad outside, where you'd like him to toilet. The smell and feel of the pad should make him think that's where he'd toileted before. Than, over time, make the pad smaller and smaller until he gets the message. Rewarding him every time he toilets in the right place also gets the message through.
Regarding the trembling and looking disoriented - how long has he been doing it? Since you took him outside to potty train him? Have you been taking him out to socialise him since you got him, carrying him about in your arms before he was protected by his shots? The consistency of stools can be effected by fear or the shots, he had recently.
Regarding the trembling and looking disoriented - how long has he been doing it? Since you took him outside to potty train him? Have you been taking him out to socialise him since you got him, carrying him about in your arms before he was protected by his shots? The consistency of stools can be effected by fear or the shots, he had recently.