In recent years, crossbreed dogs—particularly so-called “designer” breeds such as cockapoos, cavapoos (both spaniel and poodle mixes), and labradoodles—have surged in popularity across the UK. Often marketed as healthier, easier to train, and more family-friendly than purebred dogs, these hybrids have become a preferred choice for many households. However, new research from the Royal Veterinary College (RVC) challenges these widely held assumptions, particularly in relation to canine behaviour.

The Royal Veterinary College (RVC) 2026 Study: A Large-Scale Behavioural Analysis

The RVC study, published in 2026, analysed behavioural data from over 9,400 dogs across the UK, making it one of the most comprehensive comparisons of crossbreeds and purebred dogs to date. Using a standardised behavioural assessment tool, researchers examined a wide range of traits, including aggression, fear, trainability, and attachment.

The study focused on three popular “doodle” crossbreeds:

• Cockapoos (Cocker Spaniel × Poodle)
• Cavapoos (Cavalier King Charles Spaniel × Poodle)
• Labradoodles (Labrador Retriever × Poodle)

These were compared directly with their respective parent breeds to better understand how crossbreeding may influence behaviour.

Key Findings: More Problems Than Expected

Contrary to popular belief, the study found that crossbreed dogs often exhibited more undesirable behaviours than their purebred counterparts. In many comparisons, crossbreeds showed poorer behavioural outcomes, while only a small proportion demonstrated improvements.

Common Behavioural Issues Identified

Across the breeds studied, several recurring issues emerged:

• Increased aggression (towards owners, strangers, or other dogs)
• Heightened fear responses, including fear of unfamiliar objects or environments
• Separation-related anxiety
• Higher excitability and impulsivity
• Lower trainability in some cases

Cockapoos, in particular, showed the highest levels of undesirable behaviour, performing worse than both of their parent breeds across multiple behavioural measures.

Cavapoos also demonstrated poorer behavioural scores compared to Cavalier King Charles Spaniels on most traits, while Labradoodles showed mixed results—outperforming Poodles in some areas but underperforming compared to Labradors in others.

Challenging the “Designer Dog” Myth

One of the most significant implications of the RVC research is its challenge to the widespread belief that crossbreeds naturally combine the “best of both worlds.” Many owners choose these dogs expecting improved temperament, better suitability for families, and easier training. Cross Breed dogs fetch a premium for example Cockapoo puppies sell for in excess of £1,000 making them profitable for breeders.

However, the findings suggest that these expectations are often misplaced. The assumption that crossbreeds are inherently better behaved or more predictable is not supported by current evidence.

The Role of Human Factors

Importantly, the researchers emphasise that behaviour is not determined by genetics alone. A dog’s temperament is shaped by a complex interaction between inherited traits and environmental influences.

Several human-related factors may contribute to behavioural issues:

• Owner expectations: First-time or less experienced owners may choose crossbreeds believing they are easier to manage.
• Training approaches: Inconsistent or ineffective training can worsen behavioural problems.
• Early socialisation: Dogs that are not properly exposed to different environments, people, and stimuli during early development may develop fear or anxiety.

These findings highlight the importance of responsible ownership and informed decision-making.

Wider Implications for Spaniel & mixed breed Dog Ownership

The study has important implications for prospective dog owners, breeders, and animal welfare professionals:

• Informed decision-making: Choosing a dog should involve careful research into both breeds and crossbreeds.
• Avoiding assumptions: Crossbreeds are not automatically easier or better behaved than purebred dogs.
• Importance of training: Early, consistent, and positive training is essential for all dogs.
• Welfare considerations: Behavioural issues can negatively impact both the dog’s wellbeing and the owner’s experience.

Conclusion

The Royal Veterinary College research provides valuable insight into the behavioural realities of crossbreed dogs. While these animals remain popular companions, the idea that they are inherently better behaved than purebred dogs is increasingly difficult to support.

Ultimately, the findings reinforce a key message: a dog’s behaviour is shaped not just by its genetics, but by its environment, upbringing, and the quality of care it receives. As a practical step (as with all dogs but with specific benefit here for mixed breeds dogs) it is worth emphasising the importance of socialisation and training early on in the dog’s development.