Getting frustrated..Won't go outside

My Ernie is just about 9 months old. My husband and I are having no success at teaching him to go outside to use the bathroom. He wakes us up every morning, between 5:30 and 6:00 am. We can walk him around for half an hour and he will go wee-wee outside most of the time, but as far as the other-- he always waits until we come back inside. I try to watch him while getting ready for work so I can catch him in the act-- but he is very sneaky! Sometimes he will cry to go outside, and we'll go and he does his business. But other times, he will just stop and go anywhere. We love Ernie very much, but it is very frustrating to spoil him so much, yet he won't respect our one wish, TO GO OUTSIDE!! If you've had any experience with this, we would greatly appreciate some advise. Many thanks!
Ernies mom

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