Gastrointestinal Issues

Home   Services   Illness Services   Gastrointestinal Issues

Gastrointestinal Issues

Diarrhea is characterized by loose, watery, or unformed stools that occur with increased frequency, volume, or urgency. It results from a disturbance in the gastrointestinal (GI) tract that causes rapid movement of fecal material and/or decreased absorption of water and nutrients.
Veterinarians classify diarrhea based on where the problem originates:

Get a Quote

We Always Take Care Of Your Pets
During Business Hours

(210) 701-0826

For Emergency Services
Thrive Pet Healthcare Specialists San Antonio
(210) 822-2873
MissionVet Specialty & Emergency
(210) 737-7373
VEG ER for Pets
(210) 905-4640

Small Intestinal Diarrhea (Small Bowel)

  • Stool Volume: Large volume per bowel movement.
  • Frequency: Mildly increased (e.g., 3-5 times per day).
  • Urgency/Straining (Tenesmus): Minimal to none.
  • Associated Symptoms: Vomiting, weight loss, excess gas, or loss of appetite.
  • Appearance (If Bloody): Digested blood, appearing black and tarry (melena), indicating bleeding in the upper GI tract.

Large Intestinal Diarrhea (Large Bowel / Colitis)

  • Stool Volume: Small volume per bowel movement.
  • Frequency: Significantly increased (e.g., more than 5 times per day).
  • Urgency/Straining (Tenesmus): Prominent—the pet constantly strains to defecate.
  • Associated Symptoms: Mucus in the stool.
  • Appearance (If Bloody): Undigested, bright red blood (hematochezia), indicating bleeding or irritation in the lower GI tract (colon/rectum).

Common Causes of Diarrhea in Pets

The causes can vary widely, from minor irritants to chronic diseases:
Category Specific Causes
Dietary Dietary Indiscretion (eating garbage, human food, or inappropriate objects). Sudden Diet Change (switching food brands too quickly). Food allergies or sensitivities.
Infectious Parasites (Giardia, Coccidia, roundworms, hookworms, whipworms). Viruses (Parvovirus, Coronavirus, Feline Panleukopenia). Bacteria (Salmonella, Clostridia).
Non-Gi Diseases Organ Dysfunction (Kidney failure, Liver failure). Endocrine Disease (Addison’s disease, Hyperthyroidism in cats). Pancreatic Disease (Pancreatitis, Exocrine Pancreatic Insufficiency (EPI)).
Chronic / Severe Inflammatory Bowel Disease (IBD). Foreign Body Obstruction (often causing vomiting and diarrhea / straining). Gastrointestinal Cancer.
Other Stress / Anxiety (e.g., boarding, travel). Medications (especially antibiotics). Toxin / Poison ingestion.

Veterinary Care and When to Worry

Deciding when to seek veterinary attention is critical, as severe diarrhea can quickly lead to dehydration and other complications, especially in young, old, or chronically ill pets.
Signs Warranting Immediate Veterinary Care (Emergency)
If your pet exhibits any of the following symptoms along with diarrhea, seek emergency care right away:
Symptom Significance
Blood in Stool Black / Tarry (Melena) or large amounts of bright red blood (Hematochezia) can indicate internal bleeding or severe inflammation.
Vomiting Persistent or repeated vomiting in conjunction with diarrhea greatly increases the risk of severe dehydration.
Extreme Lethargy / Weakness Your pet is too weak to stand, unresponsive, or collapses.
Signs of Dehydration Dry, sticky gums; sunken eyes; or skin that stays “tented” when gently pinched.
Abdominal Pain Hunched posture, crying out when touched, or a painful/distended abdomen.
High-Risk Pet Puppies and kittens (risk of Parvovirus/Panleukopenia and rapid dehydration) or senior pets with other health issues.
Toxin Ingestion Known or suspected consumption of poison, foreign object, or toxic food.

Home Care (For Mild, Self-Limiting Cases)

If your pet has one or two episodes of soft stool but is otherwise acting completely normal (alert, eating, no vomiting), you may try the following for 12-24 hours:
Fasting (12 hours): Withhold food for about 12 hours (only for adult pets; never fast a puppy, kitten, or small dog without vet advice). Continue to offer water.
Bland Diet: After the fast, feed small, frequent meals of a simple, easily digestible diet for 2–3 days. A common bland diet consists of:
  • Boiled, unseasoned chicken breast (no skin/bones).
  • Plain cooked white rice.
  • Ratio: Approximately 1 part protein to 2 parts rice.
Monitor: Watch for improvement. If the diarrhea persists for more than 24-48 hours or worsens, contact your veterinarian.

Veterinary Diagnostic and Treatment Plan

When you bring your pet in, your veterinarian will likely perform some or all of the following:
Diagnostic Tool Purpose
Physical Exam & History Assess hydration, abdominal pain, and overall status. Detailed questions about diet, environment, and the stool itself (color, consistency, frequency).
Fecal Exam Analysis of a fresh stool sample to check for intestinal parasites (worms, Giardia, Coccidia).
Blood Work Check organ function (kidney, liver, pancreas), screen for systemic disease, and assess for dehydration or severe infection.
Imaging (ultrasound/radiographs) Used to check for foreign body obstructions, tumors, or changes in organ appearance (e.g., pancreatitis).
Treatment Fluid Therapy: Intravenous (IV) or subcutaneous fluids to correct or prevent dehydration and electrolyte imbalance.
Medications: Anti-nausea drugs, anti-diarrheal agents, antibiotics (if a bacterial infection is suspected), or dewormers.
Probiotics: Supplements to restore the healthy balance of gut bacteria.
If your pet is currently experiencing diarrhea, please be prepared to describe the stool in detail (color, consistency, presence of blood/mucus) and note any other symptoms (vomiting, lethargy, loss of appetite).

Blood Chemistry Panel

The Chemistry Panel evaluates the function of major internal organs and checks metabolic health.
Marker / Organ What it Checks For
Kidney Function (BUN & Creatinine) Detects early signs of Kidney Disease, which often shows no symptoms until the kidneys have lost significant function.
Liver Function (ALT, ALP, Bilirubin) Checks for Liver Disease, damage, infection, or issues with bile flow.
Glucose (Blood Sugar) Screens for Diabetes Mellitus
Proteins (Albumin & Globulin) Monitors the immune system and Hydration Status
Electrolytes (Sodium, Potassium) Assess for Dehydration and certain hormonal diseases like Addison's disease.

Additional Routine Diagnostics

Test Description and Purpose
Urinalysis Analysis of a urine sample to check for Urinary Tract Infections (UTIs), Kidney Disease, bladder stones/crystals, and Diabetes (detects glucose in urine).
Fecal Examination Microscopic analysis of a stool sample to detect Intestinal Parasites (worms, Giardia, Coccidia).
Thyroid Testing (T4) Often added for middle-aged to senior pets. Screens for Hyperthyroidism (common in cats) or Hypothyroidism (common in dogs).
Heartworm Test A simple blood test, typically done annually for dogs, to check for the presence of heartworm disease.

The Importance of Annual Diagnostics

Routine diagnostic testing is the foundation of preventive medicine in veterinary care, offering several life-saving benefits:
Early Disease Detection (The Silent Detective)
Many serious conditions—such as early kidney disease, liver disease, and diabetes—do not show obvious outward symptoms until they are advanced and more difficult, or expensive, to treat. Bloodwork acts as a “silent detective” that can reveal subtle changes in organ function months or even years before your pet starts to feel sick. Early intervention drastically improves the prognosis.
Establishing a Health Baseline
Annual testing helps establish a “normal baseline” for your individual pet. Every pet has unique blood values. By testing annually, your veterinarian learns what is normal for your pet. If a future test shows a slight deviation, the vet can compare it to your pet’s personal baseline and immediately recognize a significant trend or an emerging health issue.

Safety for Senior Pets and Anesthesia

  • Senior Pets: Pets age much faster than humans. For senior pets (typically ages 7 and up), testing is often recommended every six months because they are at a higher risk for age-related conditions.
  • Pre-Anesthetic Testing: Before any surgical procedure, including routine dental cleanings, bloodwork is crucial to ensure the kidneys and liver can safely metabolize and clear the anesthetic medications. This minimizes the risk of complications during the procedure.

Monitoring Chronic Conditions

For pets on long-term medications (e.g., for arthritis, seizures, or thyroid disease), regular bloodwork is essential to monitor the medication’s therapeutic levels and check that it is not causing damage or negative side effects to the kidneys or liver over time.
By investing in annual diagnostics, you are actively seeking to manage your pet’s health proactively, which often leads to a higher quality of life and can potentially extend your time together.

Vet Triage

Vet Triage is a veterinary telehealth company that is able to provide high level veterinary care to those who need vet services after our working business hours (nights and weekends). They will send us a report so that we can follow up with you for continued care.

Our Satisfied Customers

Follow Us On Our
Social Media
paw prints
About Us
At Pawtnered Care Mobile Vets, we believe that quality veterinary care should come to you — where your pets feel safest and most comfortable. Our mission is to provide compassionate, professional, and convenient in-home veterinary services, eliminating the stress and hassle of traditional clinic visits.
logo white