They start scratching at their cage relentlessly, and when you feel their bellies you can feel some hard balls in there. (If they're not too fat, like cass. Sometimes when she's prego I can't tell until she starts scratching). You need to provide a lay box for them, or use a 10 gal screen top. On my recent post with Cleopatra laying, I included pics of her lay box I used. You can use washed play sand, perilite, organic soil, etc... for them to lay in, just make sure it is damp enough that when they're tunneling it doesn't cave in on them.I'm not planning on breeding. But after having a bird get an egg caught (and we didn't think she was a female) I'm wondering about Sahara laying unfertilized eggs.
How can you tell they have eggs? What needs to be done?
Learn new stuff all the timeQuite often you cannot feel or see infertile eggs. many times they are not full, but squishy. In this case you have to otherwise read your dragon as Aleena said.