October 2026

Second Dog Statistics: Real Data on Regret, Training Difficulty, and What Makes Multi-Dog Households Work

By the ThisDogIsCute Research TeamLast updated: October 5, 202611 min read 25.3% In the largest study of dogs referred for fighting with a housemate — 305 pairs evaluated at a veterinary behavior clinic — roughly 1 in 4 pairs (55 of 217 with full follow-up) still had a poor long-term outcome even after professional treatment. […]

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Does the 3-3-3 Rule for Rescue Dogs Actually Hold Up? What the Real Data Shows

30% In the only study that has actually asked adopters how long their dog took to adjust, just 30% felt their dog was settled by the 3-month mark the “3-3-3 rule” promises — 41% said 4-6 months, 11% said 7+ months, and 19% said their dog still hadn’t adjusted. Source: Moyer, Zulch, Ventura & Burman,

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Does Reactive Dog Training Actually Work? Real Success Rates and Timelines by Method

81% In the largest survey of its kind — 963 dogs with owner-reported aggression — 81% of owners who consulted a board-certified veterinary behaviorist found that professional’s advice helpful. No single method in the published data reaches 100%, but most dogs measurably improve. Source: Dinwoodie, Zottola & Dodman, Journal of Veterinary Behavior, 2021 Key Findings

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How Common Is Separation Anxiety in Dogs, Really? What the Studies Actually Show (2026)

85.9% → 9.3% The exact same 43,517-dog national dataset produced a separation-related-behavior prevalence of 85.9% in one analysis — and 9.3% when independent researchers re-analyzed the identical data using more appropriate statistical methods. Source: Beaver et al., Journal of Veterinary Behavior, 2024–2025; re-assessed by Serpell & Powell, 2025 Key Findings at a Glance → Re-analyzing

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Which Dog Breeds Are Most Likely to Be Returned to Shelters (And Why)

The only large-scale peer-reviewed study to actually measure this found toy breeds were 65% less likely to be returned than herding breeds, and terriers were 35% less likely — but the bigger factor wasn’t breed at all. An adult dog between 2 and 8 years old was over three times more likely to be returned

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