I think it was this new treat. The little nephews were over last weekend and they gave them their belated Xmas gift. One of which was a treat with rosemary, chicken, some other stuff. Ingredients looked good. It's the only thing that's been different in their diet.
Last night before bed time I took them out one last time. I always pay more attention to Uni bc she sometimes pees on her butt hairs and I lift her butt up when she pees. So I saw Toto pooped, and went and followed Uni, then came back to Toto to see if he peed and the poop was gone!

I was so grossed out I made him sleep in his crate last night. But this morning, then he pooped on the stairs and he didn't eat it. But he has been pooping more than usual. No more treats.