Spaying your dog is one of the most common veterinary procedures, often recommended to prevent unwanted pregnancies, reduce health risks, and stop the heat cycle (estrus). Most pet owners expect their dog’s reproductive behaviors—like howling, restlessness, or attracting male dogs—to disappear after spaying. But what happens when your spayed dog starts showing estrus symptoms again? If your furry friend is acting like she’s in heat even after surgery, you’re not alone, and there’s an explanation for it.
In this blog, we’ll dive deep into why estrus symptoms can persist after spaying in dogs, what signs to look for, and what you can do about it. Whether you’re a first-time dog owner or a seasoned pet parent, this guide will help you understand this unusual situation and take the right steps for your pup’s health.
What Does Spaying Mean for Your Dog?
Before we jump into the main topic, let’s quickly cover what spaying entails. Spaying, medically known as an ovariohysterectomy, is a surgery where a veterinarian removes a female dog’s ovaries and uterus. This procedure stops the production of reproductive hormones like estrogen and progesterone, which control the heat cycle. Once spayed, your dog should no longer go into heat, experience bleeding, or show mating behaviors.
Typically, spaying is a one-and-done solution. It eliminates the estrus cycle and offers health benefits like reducing the risk of mammary cancer and uterine infections (pyometra). So, when a spayed dog shows signs of being in heat, it’s natural to feel confused or worried. Let’s explore why this happens.
✔️ Also read: How Soon Can My Pet Be Spayed After Adoption?
Why Do Some Dogs Show Estrus Symptoms After Spaying?
The most common reason a spayed dog might display estrus symptoms is something called Ovarian Remnant Syndrome (ORS). This happens when a small piece of ovarian tissue is accidentally left behind during the spay surgery. Even a tiny fragment can continue producing hormones, tricking your dog’s body into acting like she’s in heat.
Here are the main causes of estrus symptoms after spaying:
1. Ovarian Remnant Syndrome (ORS)
During spaying, the vet aims to remove all ovarian tissue. However, if even a small piece remains—due to surgical error, difficult anatomy, or the tissue being in an unusual spot—it can stay active. This leftover tissue keeps releasing estrogen, triggering estrus-like behaviors and physical signs.
2. Ectopic Ovarian Tissue
In rare cases, some dogs are born with ovarian tissue outside the ovaries (ectopic tissue). This tissue might not be noticed or removed during the initial spay surgery, leading to lingering hormone production and heat symptoms.
3. Adrenal Gland Issues
Though uncommon, the adrenal glands can sometimes produce hormones that mimic estrogen. If there’s an adrenal disorder, it could cause estrus-like symptoms in a spayed dog, even without ovarian tissue present.
4. External Hormone Exposure
If your dog is exposed to synthetic estrogen—like from human medications or topical creams—it might trigger temporary heat-like symptoms. This isn’t related to the spay itself but can confuse pet owners.
While these situations are rare, they’re not unheard of. The good news? There are ways to identify and address the issue.
What Are the Signs of Estrus After Spaying?
So, how do you know if your spayed dog is experiencing estrus symptoms? The signs are similar to what an unspayed dog shows during her heat cycle. Keep an eye out for these red flags:
Swollen Vulva: The vulva may appear enlarged or slightly red, just like during a normal heat cycle.
Vaginal Discharge: You might notice a bloody or watery discharge, though it’s usually less intense than in unspayed dogs.
Behavioral Changes: Your dog could become more vocal (whining or barking), restless, or overly affectionate. She might also try to “flag” her tail or act receptive to male dogs.
Attracting Males: Even though she’s spayed and can’t get pregnant, male dogs might still be drawn to her due to hormone signals.
Nesting Behavior: Some dogs start digging or gathering items, mimicking pregnancy-like instincts.
If you spot these signs weeks, months, or even years after spaying, it’s time to dig deeper. These symptoms don’t necessarily mean something dangerous, but they do warrant a vet visit to rule out complications.
✔️ Also read: Will My Pet Stop Marking After Being Neutered?
How Is This Diagnosed?
If your spayed dog is acting like she’s in heat, don’t panic—schedule a vet appointment. Your veterinarian will use a combination of tests and exams to figure out what’s going on. Here’s what to expect:
Medical History Review: The vet will ask about your dog’s spay surgery, when the symptoms started, and any changes in behavior or health.
Physical Exam: They’ll check your dog’s vulva and overall condition for signs of estrus or other issues.
Hormone Testing: Blood tests can measure estrogen and progesterone levels. Elevated hormones in a spayed dog suggest ovarian tissue is still active.
Vaginal Cytology: A swab of the vaginal cells can show if your dog’s body is in an estrus-like state.
Ultrasound: This imaging tool helps locate any leftover ovarian tissue in the abdomen.
Exploratory Surgery: If tests are inconclusive but symptoms are strong, the vet might recommend surgery to look for and remove any remnants.
Treatment Options for Estrus Symptoms After Spaying
Once the vet confirms why your dog is showing estrus symptoms, they’ll suggest a treatment plan. Here’s what’s typically recommended:
1. Surgery for Ovarian Remnant Syndrome
If ORS is the issue, the best fix is a second surgery called an exploratory laparotomy. The vet will go in, find the leftover ovarian tissue, and remove it. This procedure is similar to the original spay but can be trickier since the tissue might be small or hidden. After removal, symptoms should stop, and your dog’s hormone levels will normalize.
2. Medication (Rare Cases)
If surgery isn’t an option—say, due to your dog’s age or health—medications like megestrol acetate or milbolerone might be used to suppress estrus symptoms. However, this is less common and usually a last resort due to potential side effects.
3. Monitoring and Managing
If the symptoms are mild and the vet rules out serious risks (like cancer from leftover tissue), you might just monitor your dog. Behavioral changes can be annoying but aren’t always harmful. Still, untreated ORS can raise the risk of ovarian tumors over time, so surgery is often the safest choice.
How to Care for Your Dog After Treatment
Whether your dog has a second surgery or is managed with medication, aftercare is crucial. Here are some tips to help her heal:
Limit Activity: Keep her calm and avoid rough play or long walks for at least 10-14 days post-surgery.
Check the Incision: Watch for redness, swelling, or discharge at the surgical site, and contact your vet if anything looks off.
Use an E-Collar: Prevent licking or scratching with a cone (Elizabethan collar) until the incision heals.
Follow Vet Instructions: Give all prescribed medications, like painkillers or antibiotics, as directed.
Monitor Behavior: Look for improvements in estrus symptoms over the next few weeks.
With proper care, your dog should bounce back and finally be free of those confusing heat-like signs.
Can You Prevent Estrus Symptoms After Spaying?
Since ORS and related issues stem from the spay surgery itself, prevention isn’t entirely in your hands. However, you can reduce the odds of complications by:
- Choosing an experienced, reputable veterinarian for the initial spay.
- Spaying your dog when she’s at a healthy weight (obesity can make surgery harder).
- Asking your vet to double-check for complete ovary removal during the procedure.
When to See a Vet?
Not every post-spay symptom is related to estrus. If your dog has vaginal discharge along with lethargy, fever, vomiting, or refusal to eat, it could signal a serious issue like an infection or surgical complication. Contact your vet immediately if you notice these warning signs. For estrus symptoms alone, schedule a regular visit to get to the bottom of it.
Final Thoughts
Seeing estrus symptoms after spaying can be surprising and frustrating, but it’s a manageable issue with the right approach. Ovarian Remnant Syndrome is the most likely cause, and a trip to the vet can confirm and fix it. By staying observant and proactive, you can ensure your dog stays comfortable and healthy for years to come.
Have you noticed odd behaviors in your spayed dog? Share your experience in the comments below, or reach out to your vet for personalized advice. Your pup deserves the best care—and with a little knowledge, you’re well-equipped to give it!