Everything You Need to Know About Spaying and Neutering Animals in Mexico

Spaying & Neutering is the #1 way to reduce the overpopulation and suffering of animals in the Yucatan.

All dogs and cats that are adopted from Evolución must be spayed or neutered before leaving the facility. Most of the animals at the facility have already been spayed or neutered with the exception of new arrivals, puppies/kittens too young to fix, and those currently recuperating from illness or injury. 


We strongly believe that spaying / neutering is the kindest and most responsible thing you can do for a dog or cat, and we encourage everyone – locals and visitors alike – to do their part! Look after your local street dogs, take them to a vet or get them into a spay/neuter clinic and be part of the solution!

List of Vets Around Merida

FAQ’s about Spay & Neuter

Q: Why should I spay/neuter my pet?

The overpopulation problem of cats and dogs is a worldwide problem. Every year, thousands of dogs and cats are put down in shelters and government facilities simply because they are unwanted. The problem is rampant in both mixed breeds and purebreds. The ones who are put down humanely are lucky compared to the millions who die on the streets due to malnutrition, injury or disease. Spayed and neutered dogs are less likely to roam the streets in search of a mate, therefore reducing the chance of a lost or injured pet, or spreading sexually transmitted illnesses such as TVT (cancerous tumors).

Q: What if my pet is kept inside and not allowed outside?

If your dog or cat even once accidentally gets outside the home, the potential exists for unwanted births to occur.

Q: Will my dog become fat if I spay/neuter it?

A dog’s metabolism is regulated by food, exercise, general health and heredity. Your dog or cat needs a quality diet and regular exercise to maintain a healthy body weight. Adjustments may need to be made with your pets diet after he or she is spayed/neutered to maintain a healthy weight. Consult your veterinarian.

Q: Will my male dog become less masculine if I neuter him?

It does not take away from a dog’s masculinity to have him neutered and it will not change his personality. It is not factual to attach human emotions to a dog. A dog does not feel the same way about his sexual organs that humans do. It is more responsible to have your male dog neutered and avoid unwanted puppies, and unwanted health issues.

Q: Are there any health benefits if I spay/neuter my animal?

Spayed female dogs will not develop uterine cancers or infections and are less likely to develop breast tumors. Spaying also prevents a female from going into heat, thereby preventing odor, blood staining problems, pregnancy complications, as well as contracting TVT. Neutered dogs will not develop testicular cancer and may prevent infections in the prostate glands, urinary infections, kidney disease and other problems such as TVT.

Q: Shouldn’t my dog or cat have one litter before they are fixed?

There are no health benefits whatsoever for your dog or cat to have one litter. In fact, complications in pregnancies and births can have negative health effects on your pet. Dogs and cats do not look upon motherhood in the same way that humans do. While they do have the instinct to care for and protect their young, they do not have desires to have offspring simply for the joy of having a family.

Q: What age is the best age to spay/neuter my pet?

Puppies and kittens can be spayed or neutered as young as 6 weeks. It is best to have your female spayed before her first heat (typically 6 months). Spaying a male under 6 months can prevent annoying habits from developing such as humping, wandering and aggressive or anxious behavior.

Q: Will spaying/neutering change my dog or cat's personality?

The dog’s personality does not change when your dog is spayed or neutered. Young dogs and cats typically do not experience behavioral changes, however older animals may become less aggressive, less anxious and show less desire to roam in search of a sexual partner.

Q: How is the spay/neutering done?

Females are spayed in a surgical process that involves the removal of the ovaries and uterus. Males are neutered by the removal of the testicles although the scrotal sac remains intact. Recovery time is very quick with most animals up and around within a day of the operation.

Q: Is the operation dangerous?

Spay and neuter operations are considered to be very simple, routine procedures. Healthy dogs and cats are at minimal risk. It is always best to have your veterinarian examine your animal before surgery to determine if any health conditions exist that would put your animal at risk. There is minimal risk for any healthy animal under anesthesia.

Q: Is my dog or cat too old for spay or neuter?

Many older dogs and cats can be spayed or neutered. Age alone is not a determining factor. Have your doctor examine your pet to determine whether your pet has any health problems that would negate surgery.

Q: What if I want my dog or cat to experience the joy of birth?

Dogs and cats do not feel the desire to “have a family” in the way that humans can. For these animals, it is an instinct to reproduce. On average dogs will have 1.5 litters and cats will have 2.3 litters annually. Females who are unspayed and left free to roam can have their bodies worn out with death occurring at a very young age. It is not the “joy of birth” they end up experiencing, but a body that has been overused in reproduction with many complications and extreme amounts of pain.

Spay & Neuter Resources

Check out some other organizations in the Yucatán that are making a difference with their Spay & Neuter programs.