Spaying & neutering pets

We humans are very emotionally attached to our reproductive system. Inability to have children is a very difficult situation for most people. The idea of electively removing our reproductive organs is just unspeakable. However, most people would have this procedure performed on their pets without a hesitance. Is altering our pets really what’s best for them? Interestingly enough, the evolution and living indoors for so many years (so different from their ancestors' lives) has changed the dogs' and cats' normal biology. It is now known that there are actual medical benefits for spaying and neutering pets.

Spay and neuter are the common terms for permanent surgical removal of the animal’s reproductive organs. Spay refers to removing the uterus and ovaries in females, and neuter refers to the removal of the male’s testicles. Besides the obvious advantage of preventing unwanted puppies and kittens and avoiding the whole discomfort that owners experience with the female heat and the male's response to it, there are a few important medical advantages of performing spays and neuters.

Medical advantages in females:

  • Prevention of mammary tumors (breast cancer) 

Mammary tumors in animals are usually hormone dependent.  If the queen (female cat) or bitch are getting spayed before their first heat cycle their chances of developing mammary tumors are 99.5% less than that of an unspayed female.

If the female is spayed after she has one cycle, her chances of developing mammary cancer are 92% lower than that of an unspayed female.

After the female has two heat cycles, spay will not prevent mammary tumors. Hence the best timing for female spay is before her first cycle, which is generally around 6 months of age.

Uterine cancer and ovarian cancer are prevented due to the removal of the susceptible organs.

  • Prevention of uterine infection (pyometra)

Pyometra is a condition in which the uterus gets infected and becomes filled with pus. The condition has two forms.  Open pyometra occurs when the uterine cervix is open and pus discharges. This form is less dangerous because it is easier to diagnose. Closed pyometra occurs when the cervix is closed and pus accumulates in the uterus which potentially causes uterine rupture. Pyometra is an important disease to be aware of for any dog owner because of the sudden nature of the disease and the deadly consequences if left untreated. Pyometra is a result of hormonal changes; hence spaying the animal will prevent it by eliminating the susceptible organ and the causative hormones.

Researches shows that about 90% of intact females will develop pyometra at some point in their life, usually in elderly age.

Medical advantages of neutering males

The medical advantages of neutering males are not as conclusive as in females, but still exist. Neutering males at an early age helps prevent aggression towards other males.

Intact males tend to suffer from benign (non cancerous) enlargement of the prostate gland which due to its anatomical location may interfere with urination and defecation.

Male cats tend to spray their urine around the house as a sign of territorial marking. Neutering the tom cat around the age of 6 months usually prevents this disturbing habit.

Despite the many advantages the procedures have, spaying and neutering are done surgically under full anesthesia. The procedure bears some risks similar to any other surgical procedure. Immediate complications of neutering include anesthesia related death, bleeding and infection. These risks are relatively low in routine spaying and neutering, however, they may be increased for some animals due to other pre-existing health problems.

Other main disadvantages of altering pets include:

  • Neutered male cats have greater chances of developing lower urinary tract infection including presence of urinary crystals or stones.
  • Spayed females can develop urinary incontinence due to the lack of estrogen. Both of those conditions are medically manageable.

Despite the possible complications of the procedures, spay and neuter are still generally recommended by veterinarians.

More Dr. Oz's Vet Advice articles

About the Author

Dr. Moshe Oz owns Rose Valley Veterinary Hospital, a small animal veterinary practice in West Kelowna.

Dr. Oz has deep love and affection for animals. It was his childhood dream to become a veterinarian, a dream that he has fulfilled when he graduated with honours from KUVM,on 2006. Dr. Oz's special interest is internal medicine and surgery.

In his free time Dr. Oz enjoys training and racing triathlons, including the legendary Penticton's Ironman.

Dr. Oz can be contacted through his website: www.KelownaVet.ca

The views expressed are strictly those of the author and not necessarily those of Castanet. Castanet does not warrant the contents.

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