The ubiquitous street dogs. The ubiquitous street dogs.

Oral contraceptive for street dogs is tested

Student working on food product with contraceptive properties

Valiant volunteer efforts to control the rampant growth of street dog populations are active in several places in Mexico. Now, a new oral contraceptive might make the work easier.


The contraceptive is the project of student Sheila Irais Peña Corona, who chose to base the thesis of her master’s degree on the creation of a food product with contraceptive properties.

Working in the molecular biology and endocrine regulation laboratory of the Autonomous Metropolitan University (UAM) in Iztapalapa with her supervisor, professor Héctor Serrano, Peña has only been able to work with fewer than 20 female dogs.

For that reason, she says, it’s too soon to announce the existence of a “contraceptive pellet” but she believes the results are promising.

Peña’s work is an extension of that of her supervisor, who has been researching a similar implementation of oral contraceptives on populations of bats, rodents and pigeons.

She explained that her intention is to inhibit one or two estrous cycles in female dogs with a minimal dosage added to the pellet-shaped dog food, preventing them from having pups for a year at least.


The oral contraceptive would be planted in streets where the dogs have become a public health issue, explained Peña, and their own natural quest for food would lead them to the pellets.

Other researchers at UAM and at the National Autonomous University of Mexico are also working to identify innocuous and non-invasive means to control dog populations.

No one knows how many street dogs there are in Mexico but the Mexico City Health Secretariat estimates there are over 1.2 million in its 16 boroughs, while the non-governmental organization Animal Heroes has estimated there are about 23 million street dogs throughout the country.

Common contraceptive measures such as surgical sterilization require qualified specialists and pre and post-operative care, while hormonal contraceptives have negative side effects on female dogs.

Source: Milenio (sp)

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  • jdwfinger

    I hope for her success, it is sad and terrible that there are street dogs most everywhere. That is a disgrace that t is allowed to continue.

  • kallen

    Now if we could just control the human population…..

    • natanahel

      Kallen, there is no need to control human population. Dont worry enjoy your life have kids the world is big. Do you see ants trying to control themselves? What about the birds in the sky do they need warehouses for food? Dont they get fed everyday? Are they smarter than us?? Dont stress.

  • Dennis Hoppe

    Regarding controlling the human population. It’s dammed if we do and dammed if we don’t. I’m 77 years old. If I would have been born in the 1850’s in the U.S. the average life expectancy was probably in the 50’s. So chances are I would have never reached the age of 77. So while modern medicine is allowing humans to live much longer, the extra life expectancy is causing overcrowding and overpopulation in relation to the earth’s available natural resources. I don’t know what the life span in Mexico was in the 1850’s, but the average life expectancy has probably as a whole increased. The rate of increase in the world from about 1 billion humans to approximately 7.2 billion is unprecedented and unsustainable. The amount of arable land for growing food is also much less than it was in 1804. So what is the solution to this dilemma?

    • natanahel

      Hey my friend dont worry about over crowding….dont forget that people will eventually die and rebalance once again…there is plenty of food and land…it seems crowded because everyone moved to the cities. As far as resources go..oil will run out but its ok…the sun is all we need….and dont worry about running out of sun there are trillions of em… 😉 …dont worry you will be dead by then and so will your grand children and great grandchildren…and dont worry about what they will think of you because you didnt do anything about population growth to save humanity because they wont even remember you! Do u remember your great grandparents?…anyways dont believe everything you read my friend…the people who push population control have a different agenda than your benevolent concern.

  • Pesobill

    Great idea.. Dumpy neighborhoods , dirt roads and tons of dogs ,flies and crap ..umm..Mexico..yuk. Been there done that ..

  • kallen

    Your’s is a anthropocentric viewpoint for sure.