Boa refusing to eat... help?

[hylia]

Hi everyone. I am need here and seeking some tips/advice on how to entice my snake to feed. He is a ~20 inch Hog Island Boa, weighing about 82g. I got him in November, and up until now he has had a great feeding response and has not missed a meal. l

Last Sunday, I did not offer his his regular meal since he was still "in the blue". He has since shed nicely, but still refuses to eat. Today will be 2 weeks since his last meal. I feed him f/t every 7 days and he eats in a plastic tub.

Maybe I made a mistake in trying to switch him from mice to rats after a shed. I had read that rats are much more nutritious and so I wanted to switch him. I figured that is why he refused the first time. So, I tried offering him a rat defrosted with a mouse, to transfer some scent. No go, either. finally, I just defrosted a mouse and he won't even touch that either.

He shed Thursday and I started offering him food Friday, when he did not eat I waited until the next night. I don't know what to do, he is still small and I worry about him going off food for weeks.

Is it common for Boas that previously fed very well to go through a picky please or what? How long can a Boa of his age/size go without food before I start worrying? If he does not feed in x amount of time, what can I do? I don't feed live, but would that be a solution to get him back into the "groove" of eating again?

Thanks for any advice. Worried...