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How Dogs Get Enterococcus faecalis

How Dogs Get Enterococcus faecalis

Infection

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Learn how dogs acquire Enterococcus faecalis, its transmission routes, risk factors, and prevention methods to protect your pet from infections

By 

Sustainable Vet Group

Updated on

March 11, 2025

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What is Enterococcus faecalis?

Enterococcus faecalis is a type of bacteria commonly found in the gastrointestinal tract of dogs. It is a commensal bacterium, meaning it lives with the body’s natural flora without causing harm under normal conditions. In a healthy dog, E. faecalis helps with digestion and maintains a balanced gut microbiome.

However, this bacterium can become opportunistic and pathogenic when a dog’s immune system is weakened or when there is an imbalance in gut bacteria. Factors like prolonged antibiotic use, chronic illness, surgery, or infections can disrupt this balance, allowing E. faecalis to multiply uncontrollably and spread to other tissues. When this occurs, it can lead to urinary tract infections (UTIs), wound infections, or more severe systemic infections.

Although usually harmless, E. faecalis can develop resistance to antibiotics, making infections harder to treat, especially in hospitalized or immunocompromised dogs.

How Do Dogs Get Enterococcus faecalis?

Dogs primarily acquire Enterococcus faecalis from their own gastrointestinal tract, where it naturally exists as part of the normal gut flora. However, under certain conditions, this bacterium can spread and cause infections in other parts of the body.

One of the most common modes of transmission is fecal contamination. If a dog’s feces contain E. faecalis, the bacteria can spread to the urinary tract, wounds, or other vulnerable areas through direct contact. This often happens when a dog grooms itself after defecation or comes into contact with contaminated bedding, floors, or other surfaces.

Environmental exposure is another route of transmission. Dogs can pick up E. faecalis from contaminated water, soil, or surfaces, especially in places like kennels, veterinary clinics, or dog parks. Shared water bowls, medical instruments, and poorly sanitized environments can all serve as sources of bacterial transfer.

Additionally, direct transmission can occur through licking, grooming, or ingesting contaminated food or objects. Dogs frequently use their mouths to explore their surroundings, making it easy for bacteria to spread. Immunocompromised dogs, those recovering from surgery, or those on long-term antibiotics are at a higher risk of developing infections from E. faecalis.

Risk Factors for Enterococcus faecalis Infections in Dogs

Dogs typically carry Enterococcus faecalis in their gastrointestinal tract without issues, but certain factors can increase the risk of this bacterium causing infections, particularly in the urinary tract and other vulnerable areas. These risk factors can be categorized into urinary tract-related factors and systemic conditions that compromise the body's natural defenses.

Urinary Tract-Related Factors

Several conditions affecting the lower urinary tract (LUT) create an environment where E. faecalis can thrive and cause infections:

  • Recurrent bacteriuria – Frequent bacterial presence in the urine weakens the urinary tract’s natural defenses, allowing E. faecalis to establish infections.
  • Lower urinary tract (LUT) anatomic abnormalities – Structural issues such as congenital defects or acquired conditions (e.g., urethral strictures) can lead to incomplete bladder emptying, increasing bacterial colonization.
  • Urolithiasis (bladder stones) – The presence of bladder stones creates a favorable surface for bacterial attachment and biofilm formation, making infections more persistent and harder to treat.
  • LUT neoplasia (tumors) – Tumors in the bladder or urethra can cause obstruction, tissue damage, and chronic inflammation, providing an entry point for E. faecalis to invade and multiply.

Systemic Conditions Increasing Risk

Beyond localized urinary tract issues, certain systemic health problems can compromise a dog’s ability to fight off infections:

  • Neurologic dysfunction – Conditions affecting nerve control of the bladder (such as intervertebral disc disease or spinal cord injuries) can result in urine retention, which increases bacterial colonization.
  • Endocrinopathies (hormonal disorders) – Diseases like diabetes mellitus and hyperadrenocorticism (Cushing’s disease) alter immune function and can lead to sugar-rich urine, which fosters bacterial growth.
  • Urinary incontinence – Dogs with incontinence may have prolonged exposure to urine on their skin and mucosa, allowing E. faecalis to migrate from fecal contamination to the urinary tract.
  • Corticosteroid administration – Long-term steroid use suppresses the immune system, reducing the body's ability to clear infections effectively.
  • Chronic kidney disease (CKD) – Dogs with CKD often have altered urine concentration and immune dysfunction, making them more susceptible to urinary tract infections (UTIs) caused by E. faecalis.
  • Urinary catheterization – Catheterized dogs, especially those requiring long-term urinary catheters, face a high risk of bacterial introduction into the bladder, providing E. faecalis a direct pathway to colonize the urinary tract.

Understanding these risk factors is crucial in preventing and managing E. faecalis infections in dogs. Regular veterinary checkups, proper hygiene, and addressing underlying conditions can significantly reduce the likelihood of infection.

Surgical and Post-Operative Infections Due to Enterococcus faecalis

How Surgical Infections Occur

Surgical site infections (SSIs) caused by Enterococcus faecalis can develop when bacteria enter the wound during or after surgery. Several factors contribute to these infections:

  • Contaminated surgical tools or implants – If sterilization protocols are inadequate, E. faecalis can be introduced into the surgical site through contaminated instruments, implants, or sutures.
  • Poor wound hygiene post-surgery – Inadequate wound care, improper bandage changes, or exposure to dirt and moisture can allow bacteria to multiply and infect the incision site.
  • Exposure to multi-drug resistant (MDR) strains in hospital settings – Veterinary hospitals, particularly intensive care units, may harbor antibiotic-resistant E. faecalis strains that can cause difficult-to-treat infections in post-surgical patients.
  • Pre-existing conditions like diabetes or immune suppression – Dogs with conditions like diabetes, chronic illness, or those receiving immunosuppressive therapy (e.g., corticosteroids) have a reduced ability to fight infections, increasing their risk.

Common Types of Infections in Post-Surgical Dogs

  • Soft tissue infectionsE. faecalis can cause swelling, redness, pain, and pus formation at the incision site, potentially leading to abscesses or delayed healing.
  • Deep wound infections – When bacteria invade deeper tissues, infections can become more severe, requiring drainage, debridement, or antibiotic therapy.
  • Orthopedic infections Post-surgical infections involving bones, joints, or implants (e.g., TPLO plates) can be particularly challenging to treat, often necessitating prolonged antibiotic use or implant removal.

Preventing E. faecalis infections requires strict surgical asepsis, careful wound management, and appropriate post-operative monitoring to ensure proper healing.

Orthopedic Infections After TPLO Surgery and Enterococcus faecalis

Why TPLO Surgery Is at Risk

Tibial Plateau Leveling Osteotomy (TPLO) is a common surgical procedure for repairing cranial cruciate ligament (CCL) injuries in dogs. However, TPLO surgery carries a risk of post-operative infection, particularly from Enterococcus faecalis, due to several factors:

  • Presence of surgical implants – Metal plates and screws used in TPLO surgery provide surfaces where bacteria like E. faecalis can adhere and form protective biofilms, making infections difficult to eliminate.
  • Post-surgical inflammation and healing challenges – Normal healing involves inflammation, which can create an environment conducive to bacterial growth if E. faecalis contaminates the surgical site.

Complications Caused by Enterococcus faecalis in TPLO Surgeries

  • Biofilm formation on implantsE. faecalis can develop biofilms on metal implants, creating a protective layer that resists antibiotics and the immune system, leading to persistent infections.
  • Prolonged healing time – Chronic bacterial presence can delay bone healing, cause ongoing pain, and increase the risk of implant loosening.
  • Increased risk of revision surgery or implant removal – If infection persists despite treatment, revision surgery may be necessary to remove infected implants and debride affected tissue, adding to recovery time and cost.

Preventing E. faecalis infections in TPLO cases requires strict aseptic techniques, post-operative monitoring, and early intervention if signs of infection arise.

Preventing Enterococcus faecalis Infections in Dogs

Hygiene Measures

Maintaining proper hygiene is essential in preventing Enterococcus faecalis infections. Cleanliness reduces the risk of bacterial exposure and helps keep your dog healthy:

  • Proper cleaning of bedding, bowls, and living areas – Regularly wash your dog’s bedding, food and water bowls, and living spaces to remove bacteria and other contaminants. Disinfecting these items frequently is essential, especially in environments like kennels or vet clinics.
  • Regular bathing and grooming – Keeping your dog clean through regular baths and grooming reduces the chance of bacterial buildup on their skin and fur, especially in areas like the paws or genital region, where bacteria can thrive.

Post-Surgery Care

Dogs recovering from surgery are at higher risk for infections like E. faecalis, and proper care can significantly reduce these risks:

  • Keeping wounds clean and monitored for signs of infection – Gently clean surgical wounds as recommended by your vet and watch for redness, swelling, or discharge, which could indicate an infection.
  • Following veterinary guidelines for post-op wound management – Adhere to all instructions regarding bandage changes, medication, and activity restrictions to promote healing and prevent bacterial contamination.

After surgery, keeping wounds clean and monitored for signs of infection is crucial. During surgery, advanced solutions like Simini Protect Lavage can be used by veterinary surgeons to minimize the risk of infection.

This non-antibiotic surgical lavage solution helps reduce bacterial contamination and prevents biofilm formation on surgical sites.

By using Simini during surgery, the risk of post-surgical infections is significantly lowered, contributing to faster, safer healing

Managing Underlying Health Conditions

Dogs with chronic health conditions are more vulnerable to infections, including E. faecalis:

  • Regular vet check-ups for dogs with chronic illnesses – Regular veterinary visits help manage conditions like diabetes or kidney disease, which may predispose dogs to infections.
  • Monitoring for early signs of urinary tract or surgical infections – Pay attention to symptoms such as changes in urination, discomfort, or poor wound healing, and seek veterinary care promptly if these signs appear.

By following these preventive measures, you can help protect your dog from E. faecalis infections and promote overall health.

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Conclusion

Dogs usually get Enterococcus faecalis from their gastrointestinal tract, but infections can happen in different ways, such as through fecal contamination, environmental exposure, or direct transmission from licking or grooming. Dogs with existing health issues, surgical wounds, or weakened immune systems are more prone to these infections.

Early detection and prevention are key to reducing the risks of E. faecalis infections. Keeping good hygiene, checking wounds, and managing health conditions can greatly lower the chance of infection. Regular vet visits are important, especially for dogs with chronic illnesses or those healing from surgery.

If you notice signs of infection like redness, swelling, discomfort, or changes in behavior, contact your vet right away. Quick action is crucial to stop the infection from spreading and to ensure proper treatment, which helps support your dog's health and well-being.

FAQs

Can Dogs Get Enterococcus faecalis?

Yes, dogs can get Enterococcus faecalis naturally from their gastrointestinal tract. It’s normally harmless and part of their gut flora. However, if the immune system is compromised or there’s an imbalance, E. faecalis can become pathogenic, leading to infections in areas like the urinary tract, wounds, or post-surgery sites.

What Is the Most Common Source of Enterococcus faecalis in Dogs?

The most common source of Enterococcus faecalis in dogs is their gastrointestinal tract. It lives naturally in the gut and can spread to other parts of the body, especially through fecal contamination or poor hygiene. Contact with contaminated surfaces, water, or food also poses a risk for infection.

What Causes Enterococcus faecalis Infections in Dogs' Urine?

Enterococcus faecalis infections in dogs' urine are often caused by fecal contamination, urinary tract abnormalities, or conditions that compromise the immune system, such as diabetes or chronic kidney disease. Factors like urinary incontinence, prolonged catheterization, or surgical procedures can also increase the risk of urinary infections due to this bacterium.

What Kills Enterococcus faecalis Naturally?

Enterococcus faecalis can be killed naturally by the body’s immune system, which typically fights off infections in healthy dogs. Natural remedies like probiotics and a healthy diet can help support immune function. However, in cases of infection, antibiotics are usually required to target the bacteria, especially if it’s resistant to natural defenses.

Can Enterococcus faecalis Go Away on Its Own?

Enterococcus faecalis infections can go away on their own in some cases, particularly if the dog has a strong immune system and the infection is mild. However, if the infection is persistent or severe, such as in urinary tract or surgical site infections, veterinary intervention and antibiotics are usually needed to clear the infection effectively.

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