Thanks everybody.
DD was really upset when we told her, as expected. We asked her what she wanted to do to say goodbye, and she wanted to draw a picture of him "playing" with the mice he loved catching; and include a small box of catfood so he wouldn't be hungry on his trip to find Marvin (a dog of ours who died when she was 2) and my late grandfather, who is allegedly taking care of Marvin now. She knew how much he loved hiding in the scraggly iris leaves by our steps and jumping out at us, so she pulled up some of those leaves to leave with the rose from her special bush.
She asked to see him before we said goodbye and wanted to hold him, but we explained that something happens to a body when it dies and it wouldn't feel like he normally does because of that. She instead blew some kissses and touched his incredibly soft and fuzzy fur. (she's 6)
My DH has been so good about this. He's kind of a tough guy and doesn't get weepy like we girls do, although he was clearly saddened. He's a good daddy too.
After we said goodbye to Sully we went to get coffee at Dunkies, just to get away from the house for a bit. On the way he brings up the fact that there is a new litter of kittens at my inlaws (nieces/nephews of Sully). (And believe me, after this one I am so bringing that barncat to be spayed, even if I pay for it myself. But that's a whole 'nother discussion).
He told her that if she wanted to pick one of those kittens out that she could. I was kind of taken by surprise, but I think he wanted to do it to give her something to look forward to. Thankfully they won't be ready until Thanksgiving time so *I* can adjust to not having the magnificent Sully here. I've got absolutely no problem getting another cat, at all, I just so was not expecting DH to mention it quite so soon.
So she picked out a wee little calico girl whose eyes just opened. She has a mark on her face that resembles the number 7. It goes across her forehead and down the nose. We're planning on calling her just that. Seven. There were 2 boys that look like Sul, but DD said she was afraid another yellow one would make her feel sad and miss him even more.
So over the next six or 7 weeks we'll visit her and get to know each other well. In the meantime I'm going to try to get used to not hearing his annoying scratching at the door when he wanted to go out or come in, how he slept on the back of the couch with all 4 legs hanging down and the way he loved sleeping on top of DD right by her head. He was such a cool cat.
As to what happened, well, the only thing I can come up with, based on the little bit of research I've done is he was probably poisoned somehow, perhaps getting a mouse or mole that had been baited elsewhere. We don't have a problem with mice, never have. And even if we did I wouldn't be using the poisons. What I've read matches what happened with symptom wise.
The pug has to have his stitches taken out Friday morning (he had entropion surgery 2wk ago) so I'm going to talk to our vet about what the symptoms were and see what he has to say.
Thanks again for taking the time to read and respond. I know I'm newer here, but am grateful you care about a newbie. DISers are awesome.