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Constipation Megacolon

Difficulty passing stool ranging from simple constipation to megacolon (dilated, non-functional colon).

Key Facts

Colon can store several weeks' worth of stool normally
Straining can indicate constipation OR large intestinal diarrhea
Human enemas can be toxic to pets — never use without veterinary guidance
Common causes: hair ingestion, foreign material, pelvic fractures, enlarged prostate
Lactulose, Miralax, cisapride, bisacodyl used for treatment
High-fiber vs low-residue diets both have roles in management
Subtotal colectomy (surgery) for refractory megacolon