[TLC]

Hi...I am a little worried about TJ. This morning we all got up at 5:30am. TJ and Roxy both peed after a few minutes of saying good morning. But TJ's rear (digestive area?) was making really loud sounds. I have heard them before (from TJ and Roxy) and I now know that it is from something bad that they got into and ate. In the past when I have heard these sounds, their behavior is a little playful, but more reserved. They don't want to eat, maybe a bit but that's it. Then it is a matter of waiting to poop, and it is usually very runny, lite colored and mucusy. After this poop the sounds go away and the pup is back to their normal self and is ready to eat, etc...
But this morning was different. Within 15 minutes of waking up TJ poop 2x different times, both were medium dark colored and a little soft. These sounds were going the whole time. He was so active, playful wrestling with Roxy! He ate 2 pieces of dry food and seemed ok, except for the sounds.
Now, it is time to go downstairs and they play while I get their breakfast together. They were crazy chasing and playing, but I could hear those sounds! TJ didn't want his nutrical and I made boiled chicken and rice for TJ, which he only ate a tiny, tiny bit. Roxy ate like usual (pig). After some playing, TJ pooped. I actually thought he threw up. It was very small, kinda beige/yellow in color, smelled like food and there was like 4 or 5 pieces of whole rice. So I thought he threw it up. Then I checked his butt and it was poop, I had to clean his butt. For the next hour the sounds continued.
Now it is time for them to go back in their room and me to go to work. I brought up the rice and chicken and TJ ate a few more pieces of rice and I tiny little piece of a biscuit. But within 5 minutes he ran into his box and pooped, beige/yellow non smelling, a little mucus and RICE!!!!
What is going on? Why is the food passing right through? Is that normal?
I am racking my brain to think of what he got into. The only thing that was out of the ordinary is this: Saturady was a field trip day. We visited my parents jewlery store and Hoover, I mean TJ, always found something on the floor (bugs, paper, etc.) I tried to get from him what I could, but I am sure he ate something. Next, we went to my stepmom house. She has cats, and TJ did manage to eat about 3 pieces of their cat dry food (Yellow in color), I am sure he may have eaten a piece of bird seed, paper, etc. around the house as well.
So, would that have done it? But that was Saturday today is Monday, can that stuff be effecting him now?
Also, there has been other times, not many, but a few times, where I have inspected TJ's poop and their has been unchewed pieces of chicken or meat roll. Is that normal for him to poop undigested food? Is it b/c he is not really chewing? Should I be really worried right now?
Any advice would be great!