Okay I have one fat terribilis (fatter than I'm used to seeing).
I have 5, the other 4 look perfectly average.
I separated her and she had a bowel movement earlier today.
She behaves normally - active, climbing around, cavorting with the males.
She actively wants to eat (though I'm holding back more now)
Another of my females laid her eggs as normal.
She got her adult coloration a few months ago.
She's been like this a couple weeks (I thought she was just going to lay eggs like my other female always does).
Any ideas if something is wrong?
Is she just a big frog?
I keep hesitating taking her to a vet because she's behaving so normally.

I've got one the same if not bigger.She just seems to get extra eggs in her.When she lays she goes back to normal until she fills up wiyh eggs again.

*jealous*

Any progress since the picture was taken?

She's still huge.
I took her to see a vet a couple days ago and he recommended I get a fecal sample from her - so I dropped that off for them today.
We'll see if that tells us anything.

Well that took awhile.

So...
We did one fecal sample and there was a mite in it. It could have just been a mite from the substrate - they weren't sure.
They asked me to disinfect their tank, separate her from the other 4 for awhile and then collect another fecal sample from her.
I did all that and the second sample came back clean.

She still looks and behaves the same as she always did.
I'll just leave her be.

I wonder if she's a bit eggbound and will just resorb the eggs eventually?

my immitator looks just like your phyllobate. It is larger on one side. She lays eggs quite regularly I just think she is full of eggs. Either that or mine is fat as well they definetly dont have a lack of food.

look on dendro 4 pics lots of very plump terris , just like me i think they tend to be fat asses
craig