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Infertility in cats

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

ORANGE if concurrent systemic disease, discharge, cycle abnormalities, pain, or testicular/uterine changes are present. Otherwise YELLOW (plannable) reproductive medical evaluation.

Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity

Definition

Infertility in cats refers to a cat’s inability to become pregnant or successfully carry a pregnancy to term. This can affect both male and female cats and can have various causes, ranging from hormonal disorders to physical abnormalities.

Can Occur with the Following Diseases:

Basics and possible causes

Infertility in cats can be caused by a variety of factors. These range from genetic predispositions to environmental factors and specific health problems. Basically, infertility can be divided into two categories: primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. and secondary infertility. PrimaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. infertility occurs when a cat has never been pregnant, while secondary infertility indicates that the cat was previously pregnant but is now having difficulty becoming pregnant again.

Hormonal disorders are a common cause of infertility. In female cats, irregularities in the estrous cycleThe estrous cycle is the cycle of sexual reproduction in female mammals, which is divided into different phases, including estrus (heat). The cycle includes changes in behavior as well as physiological changes. or anovulation (no ovulationOvulation is the process by which a mature egg is released from the follicle in the ovary. It occurs in the middle of the menstrual or estrous cycle and is the time of highest fertility.) can lead to problems. In male cats, a hormonal imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems. can affect spermA sperm is a male germ cell or sex cell that contributes to the fertilization of the female egg. Sperm contain genetic material that, when combined with the egg, leads to the development of a new organism. production or quality.

Physical abnormalities such as malformations of the reproductive organs, tumors, or cysts can also lead to infertility. In female cats, this can include fallopian tube blockages or uterine problems, while in male cats, issues such as cryptorchidismCryptorchidism is an anomaly in which one or both testicles do not descend into the scrotum. This can occur unilaterally or bilaterally and has potential effects on fertility and increases the risk of testicular cancer. or a narrowed urethra can be problematic.

Infections and inflammatory conditions of the reproductive organs, such as pyometra (uterine infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease.) in female cats or prostatitis in male cats, can also lead to infertility. These infections can be caused by bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease., viruses, or fungi.

StressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and environmental factors also play a role in the fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm. of cats. StressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. can disrupt the hormonal balance and thus affect the reproductive cycle. Factors such as overcrowding, poor nutrition, and inadequate care conditions can also impair fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm..

Genetic factors should not be overlooked. Certain breeds may have a genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. to infertility, and inbreeding can increase the risk of genetically related fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm. problems.

Typical accompanying symptoms

Irregular estrous cycleThe estrous cycle is the cycle of sexual reproduction in female mammals, which is divided into different phases, including estrus (heat). The cycle includes changes in behavior as well as physiological changes.: Female cats show irregular or absent heat cycles, which may indicate hormonal problems.
Behavioral changes: Both sexes may show changes in behavior, such as increased aggression or apathyApathy refers to a state of indifference and reduced interest or lack of emotional involvement in activities or events that would normally arouse interest., indicating hormonal disorders.
No interest in mating: Both male and female cats may show a reduced interest in mating, which indicates physical or hormonal problems.
Abnormal discharge: In female cats, unusual discharge from the vagina may indicate infections or other gynecological problems.
Weight gain: Unusual weight gain or loss can indicate hormonal disorders or health problems in both male and female cats.
Pain or discomfort: Physical discomfort, such as abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. pain or discomfort when touched, may indicate internal problems.
Sterility in male cats: No pregnancy occurs despite repeated mating attempts with fertile female cats.

When to see a vet?

A veterinarian should be consulted if infertility is observed in a cat over extended periods, especially if it previously had no problems becoming pregnant. Also, if accompanying symptoms such as unusual discharge, pain, behavioral changes, or drastic weight fluctuations occur, a veterinary visit is advisable.

As soon as an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. or serious health problem is suspected, veterinary advice should be sought immediately to prevent the condition from worsening. Especially in female cats showing signs of pyometra, quick action is crucial.

A veterinarian should also be consulted promptly for male cats who have not had successful matings over a longer period of time or who experience noticeable behavioral changes.

Symptom recognition for the pet owner and veterinary diagnostic procedure

For the pet owner, it is important to watch for signs of infertility, such as lack of pregnancy despite mating, changes in behavior, or in the reproductive cycle. Notes about the cat’s behavior, diet, and any symptoms can be helpful in providing the veterinarian with a comprehensive picture.

The veterinary diagnostic process typically includes a thorough physical examination, followed by specific tests to determine the cause of infertility. These tests may include blood tests to check hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. levels, ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. examinations to identify abnormalities of the reproductive organs, and spermA sperm is a male germ cell or sex cell that contributes to the fertilization of the female egg. Sperm contain genetic material that, when combined with the egg, leads to the development of a new organism. analysis in male cats.

In cases where infections are suspected, sampling and cultures may be necessary to determine the exact type of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. and develop appropriate treatment options.

What the pet owner can do and professional therapy options

The pet owner can help by ensuring the cat receives a balanced diet and lives in a stress-free environment. A healthy diet and adequate exercise promote overall health and can help reduce hormonal imbalances.

If an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. is suspected, it is important to take the cat to the veterinarian as soon as possible to begin appropriate treatment. Antibiotics or other medications may be necessary to fight the infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease..

The pet owner should also follow all veterinarian recommendations, including administering medications or implementing special care and management measures to promote the cat’s fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm.. Regular veterinary checkups can help monitor the cat’s health status and make adjustments if necessary.

Outlook on current research

Research on infertility in cats is constantly evolving, as this symptom is of considerable interest to both breeders and owners. Current studies focus on identifying the genetic factors that influence fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm. in cats. Researchers are analyzing the DNA of cat populations to find specific genes or genetic markers associated with fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm. problems. This genetic information could help develop selective breeding programs in the future that minimize the risk of infertility.

Another significant area of research is examining the influence of environmental factors on cat fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm.. Scientists are investigating how nutrition, living conditions, and stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. can affect the reproductive health of cats. Numerous studies have shown that a balanced diet and a stress-free environment can promote fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm.. Future research could identify specific nutritional plans and environmental adjustments that improve fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm. in cats.

The role of hormones is also being intensively studied. Modern research focuses on how hormonal imbalances affect fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm.. New diagnostic procedures are being developed to measure and control hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. levels more accurately. By improving hormonal diagnostic methods, veterinarians can create more precise treatment plans to combat infertility. In the long term, this could lead to new therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. options that improve hormonal balance in cats and promote fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm..

A promising area of research is the development of assisted reproductive techniques, such as artificial insemination and in vitro fertilization, specifically for cats. These techniques could be of critical importance, particularly for valuable breeding cats or endangered species. Current research focuses on making these procedures more efficient and cost-effective to make them more widely applicable in practice.

In summary, research on infertility in cats is advancing on multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. levels simultaneously. The combination of genetic, environmental, and hormonal studies opens up new possibilities for diagnosing and treating fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm. problems. These advances could not only improve the breeding of domestic cats but also contribute to the conservation of endangered cat species.

Frequently asked questions

1. What does infertility mean in cats?

Infertility in cats means that a cat is unable to produce or conceive offspring. It can affect both male and female cats and be caused by various factors.

2. How do I know if my cat is infertile?

Typical signs of infertility are the absence of pregnancy despite regular mating or the lack of reproductive behavior. A veterinarian can determine whether a cat is infertile through examinations and tests.

3. What tests are available for diagnosing infertility in cats?

To diagnose infertility, ultrasound examinations, hormone analyses, genetic tests, and sperm analyses can be used. These help identify the cause of infertility.

4. Can infertility in cats be treated?

Yes, in many cases, infertility can be treated. Treatment depends on the cause and may include hormone therapies, dietary changes, or surgical interventions. A vet can create a suitable therapy plan.

5. Can stress affect my cat's fertility?

Yes, stress can have a significant impact on cat fertility. A stress-free environment and a stable routine can help improve reproductive ability.

6. Does nutrition play a role in the fertility of cats?

A balanced diet is important for overall health, including reproductive ability. Malnutrition or an imbalance of certain nutrients can impair fertility.

7. Are there genetic causes for infertility in cats?

Yes, genetic factors can play a role. Certain genetic abnormalities or hereditary diseases can lead to infertility. Genetic tests can help identify such genetic problems.

8. Can castration be reversed to remedy infertility?

Castration is usually irreversible. In male cats, a vasectomy can be reversed in rare cases, but there is no guarantee that fertility will be restored.

9. What role does age play in the fertility of cats?

Age can affect fertility. Young cats are generally more fertile, while older cats often have difficulty becoming pregnant or remaining fertile.

10. Are there preventive measures against infertility in cats?

A healthy diet, regular veterinary examinations, and a stress-free environment can have a preventive effect. Additionally, controlled breeding should be practiced to avoid genetic problems.