The number of scientific procedures involving dogs, cats, horses and monkeys in Great Britain increased by 7% last year, despite a small decrease in the overall number of animal experiments.
Use of specially protected species rises
New Home Office statistics show that 17,317 procedures were carried out using ‘specially protected species’ in 2025, a 7% increase compared to 2024. The figures include 2,889 procedures involving dogs (up 9% from 2024), 2,236 involving monkeys (up 15%), 91 involving cats (up 11%), and 12,101 involving horses (up 5%).
The increase is particularly concerning because these species receive additional legal protections under the Animals (Scientific Procedures) Act 1986. However, despite these safeguards, their use in research has continued to rise at an alarming rate.
Overall animal experiments fall by just 3.8%
The new statistics show that 2,537,507 scientific procedures involving living animals were carried out in Great Britain in 2025 – a 3.8% decrease compared with 2024.
Of these, 52% were experimental procedures, while the remaining 48% involved the creation and breeding of genetically altered animals for research.
More than half (54%) of all experimental procedures were carried out for basic research, aimed at increasing scientific knowledge rather than developing new treatments. Around a quarter (26%) were for applied research into disease, while 19% were for regulatory purposes, such as the testing of new drugs.
The statistics also show that 17,593 procedures, around 1.3% of all experimental procedures, were classified as “severe”, meaning animals were likely to experience severe pain, suffering or distress.

95% of monkeys imported from overseas
In a concerning trend that has continued for several years, the majority of monkeys used in experiments were imported from overseas. The statistics show that 95% of cynomolgus monkeys used in procedures were born in Africa or Asia before being transported to Britain, meaning they endured the additional stress of long-distance transportation before even reaching the laboratory.
Forced swim tests continue
Among the experiments recorded were 93 instances of the forced swim test using mice. This outdated test, developed in the 1970s, involves placing mice in an inescapable container of water and observing their behaviour. It has historically been used in antidepressant research but has faced growing criticism because of its lack of relevance for understanding human depression and predicting whether new treatments will work in patients.
In its 2025 Replacing animals in science strategy, the Government confirmed that no new licences for using the forced swim test as a model of depression would be issued in future. However, these figures show that the strategy has not yet had a meaningful impact on bringing the use of the test to an end.
Human-specific technologies offer a better alternative
This disappointing decrease in animal use highlights the need move away from animal experiments by investing in human-specific research methods such as organ-on-chip technology, AI and research using human cells and tissues. Because these approaches are based directly on human biology, they can improve the development of new medicines, replacing outdated animal experiments while making treatments more effective for patients.

We need Herbie’s Law now – you can help
The figures come as the Government faces growing pressure to deliver on its manifesto commitment to work towards phasing out animal testing. We are calling for the urgent introduction of Herbie’s Law: proposed legislation that would establish a timetable to phase out animal experiments over the next decade while supporting scientists to adopt modern, human-specific methods.
If you’re concerned by these figures, you can help create change. One of the most effective ways to make your voice heard is by contacting your MP and asking them to support Herbie’s Law. Use our simple tool to contact your MP now. Every message helps demonstrate the growing public support for replacing animal testing with more effective, human-specific science, bringing us closer to a kinder future without animal testing.
A message from our CEO, Carla Owen:
“Today’s Home Office statistics are a sobering reminder that progress towards ending animal experiments is happening far too slowly. While we welcome any reduction in animal use, this dismal 3.8% decline is unacceptable while millions of animals continue to be used in British laboratories every year. Behind every statistic is a living animal capable of feeling pain, fear and distress.
These statistics reinforce why Herbie’s Law is needed now more than ever. Britain has the opportunity to become a global leader in modern, human-specific research, but that requires political commitment to accelerate the replacement of animal experiments with innovative alternatives.
We are calling on everyone to support change by to asking their MP to support Herbie’s Law. Together, with public backing, increased awareness and government commitment, we can help create a future where outdated animal experiments are replaced with cutting-edge, human-specific technologies.”
