Dog heart rate spikes, cat oxytocin release tied to owners' affectionate cues

A study by the British firm Canine Cottages found that dogs’ heart rates increased by up to 46 %—from an average of 67 beats per minute to about 98 BPM—when they heard their owners say “I love you.” The same research showed a 23 % heart‑rate drop when the dogs were hugged, suggesting physical contact can calm them.

Veterinarian Axel Haleby of Inaba Chile explained that the hormone oxytocin, often called the “love hormone,” is released in pets during affectionate interactions such as eye contact, petting, and, for cats, purring. Oxytocin reduces cortisol and blood pressure, enhancing calm and trust. Haleby emphasized that consent matters with cats, as forced contact can reduce oxytocin levels.

These findings highlight measurable physiological responses in dogs and cats to human affection, underscoring the deep emotional bond between pets and their owners.