By: Ian Murnaghan BSc (hons), MSc - Updated: 14 May 2025|*Discuss
Many members of the public are interested in learning what happens to animals after they are used for testing to ensure they are treated humanely. In fact, those who work with these animals often share this sentiment.
Virtually everyone cares about the well being of animals and it’s important to make sure animals are ethically treated not only during testing but also afterwards. However, we first need to briefly look at what is happening to animals during testing before we can understand the decisions needed regarding animal welfare after testing.
Animals During Testing
You may already know that animals are used in testing for a variety of purposes. In more recent years, their use in cosmetics has been banned in many parts of the world. During testing, animals may receive anesthesia to control or eliminate pain they could potentially experience.
As expected, what will happen to an animal after testing depends on its health and viability after testing. Since many experiments conducted on animals are actually considered minimally invasive, these animals will be used again for testing purposes in another experiment. Such minimally invasive experiments can include the provision of blood or urine samples from the animal.
Where surgical procedures are involved, an animal may be euthanized after the experiment. For example, an animal may have tissues or organs removed for analysis after a treatment.
Many people do not realise that animals used in experiments are usually bred in captivity. These animals cannot simply be sent into the wild or into homes as they would not be able to cope and survive. While some people question why this does not occur, the reality is that it would not be humane to do so despite it seeming like an attractive option in theory.
Euthanizing Animals After Testing
For animals that must be euthanized after testing, this is done quickly and humanely to avoid any pain to the animals. There is a wide variety of methods used to euthanize animals after testing, depending on the animal.
Some animals are euthanized using a gas that is inhaled and results in rapid death. The animal may be put into a chamber where it will then inhale the gas. An example of a gas used is carbon monoxide.
Another method used to euthanize an animal after it is used for testing is a sedative or anesthetic. In fact, such methods are used in water to euthanize fish that have been used for animal testing.
There are other methods used that may sound rather barbaric but actually result in a very fast death for the animal. These methods involve physical force such as decapitation or breaking the animal’s spine. Often, this is the method of choice for smaller animals.
Yet another option is brain irradiation. This allows a researcher to still keep brain tissue while causing rapid death to the animal. Typically, this method of euthanization is appropriate for rodents. Although not widely used, gunshots are also used to euthanize animals after testing. Electrocution is used as well, particularly for larger animals such as cattle or sheep.
Common Misconceptions About Animals After Testing
A common misconception about animals after testing is that they can simply be released into the wild or adopted. For a variety of reasons, this would be far less humane than killing the animals. For instance, there are strict laws and regulations controlling the release of animals into the wild. When it comes to the idea of adoption, animals used for testing would not be able to cope with the home environment. Most animals used for testing are bred specifically for that purpose. Also, the injuries sustained from testing would make it unrealistic for them to be placed in a home.
Caring for Animals After Testing
There are, however, still some rare exceptions where it can be successful to place animals in a ‘home’ after testing. There is one ranch in particular that has accepted animals after laboratory testing. Animals accepted include sheep, pigs, dogs and cats. Such places, however, are a minority.
What Can You Do?
Members of the public continue to be concerned about what happens to animals – both during and after testing. What you can do is to stay up-to-date on news about animal testing to learn more about how these animals are treated.
Contrary to popular belief, most scientists and animal technicians care deeply about animals and want to ensure humane treatment during and after animal testing. These animals are used to find treatments to improve and save human lives. However, the animals’ well-being is also respected to the fullest extent possible. The small number of researchers who have brought a poor name to the area of animal testing are held accountable by members of the public – just like you – who write letters and campaign publicly against such treatment.
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In 2004, the FDA estimated that 92 percent of drugs that pass preclinical tests, including “pivotal” animal tests, fail to proceed to the market.38 More recent analysis suggests that, despite efforts to improve the predictability of animal testing, the failure rate has actually increased and is now closer to 96 percent. The main causes of failure are lack of effectiveness and safety problems that were not predicted by animal tests.40
Usually, when an animal model is found wanting, various reasons are proffered to explain what went wrong—poor methodology, publication bias, lack of preexisting disease and medications, wrong gender or age, and so on. These factors certainly require consideration, and recognition of each potential difference between the animal model and the human disease motivates renewed efforts to eliminate these differences. As a result, scientific progress is sometimes made by such efforts. However, the high failure rate in drug testing and development, despite attempts to improve animal testing, suggests that these efforts remain insufficient to overcome the obstacles to successful translation that are inherent to the use of animals. Too often ignored is the well-substantiated idea that these models are, for reasons summarized here, intrinsically lacking in relevance to, and thus highly unlikely to yield useful information about, human diseases.
Dr. Spencer Reid - 2-Dec @ 1:35 AM
I entirely disagree with all animal experiments. They are archaic and hideously cruel. They cannot express pain like humans and their systems are different to ours. We would not ead dog or cat food or any other pet food. Very little that humans eat is good for animals. There's a starter.
What is perhaps a bigger crime is that the experiments are carried out with very little being told to the public. Monkeys go mad confined in cages. Dogs are fed gruel. Having so many different animals in one place is contrary to nature. Knowing that all living things are different with similarities, inevitably, tells us that the idea is outdated. The latest news on Corona virus used the term trials instead of experiments to divert attention from what really goes on.
Most are ineffective and more money gets wasted in the process. Human trials have been tried and proved a success. This should be the way forward.
Adam - 25-Nov @ 12:03 PM
Is animal testing inhumane and cruel? Of course. But for example, let's say that someone has diabetes and the only way to find a cure is to make that person take the insulin or whatever cure. If the experiment is deadly they know because it will kill you but then we know that it's successful because you lived to tell it another day. Do you want to kill a cute little puppy or do you want to take the risk.
arodez - 29-Jan @ 1:37 AM
I think animal testing is cruel and should never be done to animals because they did not do anything to you so you should not do anything to the animals that can not protect themselves they are not even being used for anything good they are just being used to die
greatat - 8-May @ 5:47 PM
I think that animal testing is good and bad at the same time. The good thing is that it has created many cures and other things that help humans, the bad thing is that it harms and kills a bunch of animals every day.
:) - 12-Feb @ 10:58 PM
Research animals are treated very humanely. If you are against it so much, then I hope you put your money where your mouth is and refuse medical care. All of it. Every pill, even vitamins and over the counter drugs were first tested on animals. Every medical procedure is too. Animals are injected with viruses, venoms, and vaccines to produce antibodies and insulin.
For research to stop, people need to stop using medical treatments.
If you see doctors, have procedures done, and take medications, you either support research or practice selective hypocrisy
ceg07 - 17-Nov @ 4:54 PM
No animal should have to suffer for someone's beauty. No animal should have to suffer for a person to live. Animals are like people, they have feelings too. Why can't animals just be free? What they do to you to make you make them suffer. They only want care, attention, love, and a safe environment. If it's not ok for someone to abuse their pet, then why should a scientest purposely try to kill them. people are just too violent these days. Why do you have to take it out on innocent creatures? Why can't scientests just grab some people on death row and test on them? Than the tests might actually work on actual people in the eal world insted of a dud. The next time you see an animal not in a lab you should tell them they are extremely lucky that they were not born going into a deadly experiment. RESPECT THE ANIMALS. THEY DESERVE TO LIVE.
AgainstAnimalTesting - 18-Mar @ 11:53 PM
I believe that animal testing should be banned because my dog stella was used in a lab before she survived they did windex make up and other stuff to her she is only 10 years old in dog years i love so much go to some sites i forgot there names but some have when you can donate money and they give it to people to rescue animals from labs and stuff and bring to place to get homes and other stuff this is good lie this site because im doing a argumentive essay for school in 7th grade.
taytay - 1-Mar @ 8:06 PM
There are animals bred specifically to be used as food.How many people who are upset about animal testing eat beef, chicken, pork etc?Humans do get tested on through clinical drug trials. And some of them have been hurt and killed if they've had a bad reaction. Some drugs are tested on animals. Would you not use a life-saving drug because it was tested on an animal?I understand the controversy, but I've never seen anyone come up with a better alternative. How should these things be tested?
Mb - 7-Feb @ 1:51 AM
"Many people do not realise that animals used in experiments are usually bred in captivity. These animals cannot simply be sent into the wild or into homes as they would not be able to cope and survive. While some people question why this does not occur, the reality is that it would not be humane to do so despite it seeming like an attractive option in theory."
I love how the justification for not sending animals into the wild or into homes is because the animals are bred specifically, and exclusively, to suffer and die as test subjects, as if that is itself an acceptable situation. And I'm not even saying animal experimentation is wrong—just admit that you don't particularly care whether there is suffering or not, or whether a test is "humane" or not.
Chris L. - 1-Jan @ 10:04 PM
This sickens me. How are these barbarians making animal testing sound like a good thing?! It is rare animals are put on anesthetic and they wouldn't either because the scientists need to see their personal reaction. THIS IS A BUNCH OF LIES!!!! Animal testing may work on animals but there are rare cases it also works on humans! There is still different DNA in their skin to ours although their souls are still the same. TEST IT ON PEOPLE THAT DESERVE IT LIKE MURDERERS AND RAPISTS!!!!!!!!!!
Tiahna - 17-Sep @ 11:29 AM
Animals play an important part in our life they diserve to live!
Sam - 5-May @ 12:16 AM
don't all animal deserve a chance to live a life in the wild and not in a lab?
trin - 24-Apr @ 2:23 PM
I am a HSUS member. I hate animal and humane and planet abuse. However,in our money driven society, chemicals will be around as long as we purchase them. Think about it.
Boss - 11-Mar @ 12:06 PM
Horrible. Animal testing should have never been created.
AnimalLuv - 27-Feb @ 6:47 PM
i think that neither animal testing and human testing are both wrong and although we would have nothing to test on we should use the recently deceased or something similar, animals do deserve to live as well as humans. animals are as close to a friend as a human can get and humans need each other to survive this strange thing called life... (even though people can be really annoying)
oreo - 17-Feb @ 11:22 PM
Why don't they use humans to test on, ANIMALS DISEVE TO LIVE!!!!
Monkey - 12-Feb @ 2:22 PM
They can just do testing on humans right,animals deserve to live!!!
Monkey - 12-Feb @ 2:16 PM
I personally believe, that animals should not be tested on, ever. They just want to be loved and wanted. Should we really take that for granted? I mean, thousands of harmless animals should die every day because of animal cruelty. So, no animals shouldn't be tested on.
Anna - 13-Dec @ 7:09 PM
I think this is discusdiscussing and peoolpeople should put a stop to this. No animal should go through the abuse and neglect that these companies put them in.
alexa - 4-Dec @ 12:57 AM
These are all good things about animal testing!
SkyHigh - 24-Nov @ 2:46 AM
You are saying the good things! They MAY get anesthetic, most times they do not! It is animal cruelty!
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