Nice to see pic (avatar) of ypur pair too!
The first looks like pee spots to me.
The poo certainly looks suspicious.
I don’t want to say with certainty “it is X condition” because I’m not qualified to do so. However, I do think your reading up on this syndrome could be worthwhile to see if anything rings true. It’s oddly known as Cow Poop Syndrome (or cow pile) and has various other technical names. Similar to mega colon but not true megacolon like cats or dogs would get.
Just be aware their isn’t a lot of scientific info out there and much about the condition is unknown. A lot of stuff is anecdotal info from owners. You’ll probably find a bit on these forums also. I know i for one have posted about it numerous times.
The cause of his odd poop could be something completely different but I do think knowing about this condition is worthwhile so you can ask your vet. Even show the the photo.
Keep us updated how you go Friday and best wishes!