Straining in the litter box
Producing little or no stool
Hard, dry, or small stools
Going to the litter box more often than usual
Crying or appearing uncomfortable while trying to defecate
Spending a long time in the litter box
Reduced appetite
Lethargy
Vomiting
Swollen or tense abdomen
Hiding or acting irritable
Stool outside the litter box
No bowel movement for more than 48 hours
Signs of pain when the abdomen is touched