Could allowing your dog to sleep in your bed actually add years to their life? A groundbreaking study published by the University of Arizona’s Department of Animal Behaviour in early 2025 suggests the answer might be yes. Researchers tracked over 2,400 dogs across the US and UK, measuring longevity against sleep habits and found a surprising correlation: dogs who regularly shared their owner’s bed lived an average of 18 months longer than those who slept separately. In this article, you’ll discover exactly what the science reveals about this unexpected health benefit, plus expert tips on doing it safely and whether it’s right for your pet.
📊 Key Figures 2025
- 18 months longer lifespan: Dogs sleeping in owner’s bed showed increased longevity in the University of Arizona study (2025)
- 73% of surveyed UK dog owners: Already share sleep space with their pets, according to the Dogs Trust Behaviour Report (2024)
- 28% reduction in cortisol: Measured in co-sleeping dogs during 8-week observational period, indicating reduced stress
Sources: University of Arizona, Dogs Trust, 2024-2025
Why Sharing Your Bed Could Add Years to Your Dog’s Life
The research team, led by Dr Sarah Mitchell at the University of Arizona, identified three key mechanisms behind the longevity boost. First, co-sleeping significantly reduces a dog’s stress levels through constant physical proximity and heartbeat sensing. Second, the shared body warmth improves cardiovascular stability during sleep cycles. Third, dogs with consistent nighttime contact showed improved emotional attachment markers, which correlates with better overall health outcomes in older dogs.
“We weren’t expecting such a dramatic difference,” Dr Mitchell explained in her published findings. “But when you consider that sleep quality directly impacts immune function, and emotional security is fundamental to canine wellbeing, the results started to make sense.”
✅ Expert Tip
Create a designated sleep zone for your dog at the foot or side of the bed using washable waterproof blankets. This maintains boundaries while preserving the co-sleeping benefits. Molly, a 9-year-old Golden Retriever from Brighton, started this routine six months ago and her owner reports noticeably calmer nighttime behaviour and fewer anxiety episodes during the day.
The Stress-Relief Connection
Cortisol, the primary stress hormone in dogs, decreased by an average of 28% in the study’s co-sleeping group. This matters because chronic stress accelerates ageing at a cellular level. Dogs sleeping alone typically experience minor anxiety spikes when owners leave the bedroom, triggering cortisol release that compounds over years.
The British Veterinary Association (BVA) acknowledged these findings in their 2025 wellness briefing, noting that “emotional security during sleep is as important for dogs as environmental temperature control.” This validates what many UK and US dog owners have observed intuitively for years.
What About Hygiene and Allergies?
The study controlled for hygiene concerns by examining households with consistent cleaning routines. Dogs with regular grooming and updated vaccinations posed no elevated infection risk to owners compared to control groups. However, some people do have dog allergies, making co-sleeping impractical.
⚠️ Warning
If you have severe pet allergies, respiratory conditions, or immune system disorders, consult your GP before co-sleeping with your dog. Similarly, puppies under 16 weeks and dogs with undiagnosed behavioural issues (resource guarding, aggression) should not share beds until cleared by a veterinary behaviourist.
Is Your Dog a Good Candidate?
Age matters less than temperament. The study found that even elderly dogs (over 10 years) benefited significantly, suggesting the longevity boost applies across life stages. Dogs with established resource-guarding issues or those prone to marking behaviour should be assessed by a vet before introducing bed-sharing.
The RSPCA recommends establishing clear boundaries from the start. Your dog should respond to basic commands like “off the bed” to prevent sleep disruption and maintain your authority as pack leader. This doesn’t diminish the emotional bond—it enhances it through clear expectations.
The Bottom Line
This 2025 research suggests that allowing your dog to sleep in your bed isn’t just a comfort choice—it could genuinely extend their lifespan by up to 18 months. The reduction in stress hormones, improved cardiovascular stability, and strengthened emotional attachment all contribute to a healthier, longer life. Have you already let your dog sleep on your bed? Now you’ve got science backing up what your heart already knew. Consider introducing a designated sleep zone and observing your dog’s behaviour over the next few weeks—you might notice calmer daytime temperament and deeper, more restful sleep for both of you.