Can dehydration cause blood in stool/white clumps and foul smelling in urine?

No, see Dr. Sounds like two issues present--blood in stool (=not normal) and urinary tract infection (=not normal). See your dr / urgent care / er for evaluation and treatment. If may be dehyrated as well (=not normal), you can fix w/extra fluids.

Related Questions

Have blood in urine blood in stool urine very foul smelling. Very cloudy urine. What causes this?

See a doctor. This is grossly abnormal and needs rapid and thorough evaluation. Blood from urine and stool are very severe (presuming it is not coming from your menstrual period), and cannot be ignored. See a primary care doctor now and hope you are better soon. Read more...
Bloody urine. blood in urine & stool, fowl cloudy smelling in MALE may be infection in kidney & bladder, might have fever, flank pain, chills, nausea & vomiting, need tested & treatment now. could also be fistula between rectum & bladder...need exam by surgeon... Read more...