Having trouble posting, apparently. I'll try again.
In kids, currant jelly stools and sepsis symptoms =intussuception (telescoping bowel)which is a surgical emergency. Same symptoms as the dog. It's seen almost exclusively in infants, but there is the outlier, of course. They can get very shocky very quickly, with obviously dire consequences. I'm not sure if this translates in dogs, but it would be in my differential. Good luck.