TL;DR: If your dog has not passed stool in two days, schedule a veterinary appointment within 24 hours; seek immediate emergency care if they also exhibit vomiting, lethargy, or a distended abdomen.
What are the signs and causes of canine constipation?
Canine constipation occurs when a dog has infrequent or difficult bowel movements. If your dog has gone two days without passing stool, the waste in their colon is likely becoming dry and hard, making it increasingly difficult and painful to pass. This can be caused by various factors, including dietary indiscretion, dehydration, or a lack of physical activity.
When is canine constipation considered a veterinary emergency?
- Schedule a veterinary appointment within the next 24 hours if your dog has not defecated for two days (Medium Urgency).
- Seek immediate emergency care if constipation is accompanied by vomiting, a distended abdomen, or extreme lethargy.
- Monitor closely to prevent prolonged constipation from developing into megacolon or a serious intestinal blockage.
How can providing a photo help the veterinarian triage my dog?
- Take a photo of your dog’s attempts to go or any small, hard stools they managed to produce.
- Provide visual evidence to help the vet determine the level of straining and waste consistency.
- Use these clues to help your veterinarian differentiate between simple constipation and a more serious physical obstruction in the digestive tract.
Clinical Context (Merck Veterinary Manual)
Clinical signs of constipation in dogs include tenesmus and the passage of firm, dry feces, which may appear thin or "ribbon-like" if passage is hindered by an enlarged prostate or sublumbar lymph nodes. Affected animals may also exhibit lethargy, depression, anorexia, vomiting, and abdominal discomfort. Diagnosis is confirmed through history of dietary indiscretion and physical evidence of retained feces upon abdominal palpation and rectal examination; passed feces are often putrid. In chronic or recurring cases, a complete blood count, biochemical profile including serum T4, urinalysis, and detailed neurologic examination should be performed. Abdominal radiographs can help identify inciting factors, while barium enema, ultrasonography, or colonoscopy may be needed to demonstrate obstructive lesions. Initial treatment involves dietary adjustments, ensuring access to water, and using high-fiber diets or suppository laxatives. Long-term laxative use should be discouraged unless absolutely necessary.
Chapter: Gastroenterology
Source: The Merck Veterinary Manual, 11th Edition (Page 381)