Study reveals uncertainty about pets' backgrounds deters adopters
Nearly a third of pet parents want to adopt but are held back by uncertainties around pets' health, behaviour and compatibility.
New research from Mars reveals that uncertainty about an animal's background and a lack of expert advice can deter prospective pet adopters, highlighting a critical need for guidance throughout the adoption journey.
Launched ahead of the 2026 Mars Global Adoption Weekend, the study builds on the Mars State of the Pet Homelessness Project by deepening understanding of the barriers people face when considering pet adoption, and how these can be overcome to help more pets find and remain in loving homes.
Surveying more than 26,000 people across 14 countries, the research found that while 58% of current pet parents did not adopt their pet, nearly one in three (28%) expressed a desire to adopt in the future, given the right guidance and support.
Navigating the rescue reality with confidence
Among those considering adoption, the most common concerns stem from the unknown, including undiscovered medical history (33%), behavioural background (27%) and household compatibility (25%).
The study also highlights an opportunity for greater nutrition expertise and guidance. With 71% of adopters changing their pet's diet after leaving the shelter, expert support can play an important role in helping pet parents navigate the transition and ensure their pets received appropriate, complete and balanced nutrition in a safe and informed way.
Veterinarian and pet nutrition and health science expert Esther Bijsmans said: "Adopting a pet is an exciting and rewarding experience, but practical guidance is key to building confidence and helping pets and their owners thrive together
"When welcoming home a new pet, we encourage pet parents to follow the 3-3-3 rule: the first three days are about helping a new pet feel safe, the first three weeks are about establishing routines, learning the household dynamic and building trust; and by three months, most pets will have begun to settle in. Patience and bond-building play a central role.
"Nutrition also plays a vital role in a pet's overall well-being. A common mistake is switching food too quickly. Instead, gradually transition to a new diet over 7–10 days to support healthy digestion and help pets adjust comfortably."
Clearing the path to responsible adoption
To help clear the path to pet adoption, the company is launching a new online Mars Adoption Hub that offers expert-backed advice, including from the Waltham Petcare Science Institute, and practical resources for pre- and post-adoption support.
When the right support is in place, the reward of adopting a pet is clear: pet parents cite seeing an adopted pet become relaxed and comfortable in their home (43%) and feeling like part of the family (41%) as the most fulfilling milestones of adoption.
Anthony Guerrieri, vice president, corporate affairs, Pet Nutrition, Mars commented: "Bringing a pet home should be an exciting milestone, not an overwhelming one. What this research clearly shows is that people have the heart to adopt, but they often second-guess whether they have the know-how. By giving people clear, trusted guidance from day one and supporting shelters through our Mars Global Adoption Weekend, we want to take the guesswork out of adoption and help people feel completely confident bringing home a new pet."
Building on the incredible success of last year, the 2026 Mars Global Adoption Weekend will expand to over 30 countries, helping more pets find homes.