Serotonin and Dopamine Blood Levels in ADHD-Like Dogs

Area of Science:

• Veterinary Neurology
• Neuroscience
• Animal Behavior

Background:

• Dogs can naturally exhibit behaviors similar to human attention deficit hyperactivity disorder (ADHD).
• ADHD involves complex neurotransmitter systems, including serotonin and dopamine.
• The domestic dog serves as a potential animal model for studying ADHD.

Purpose of the Study:

• To investigate serum serotonin and dopamine levels in dogs displaying ADHD-like behaviors.
• To determine the relationship between these neurotransmitters and specific ADHD-like symptoms in dogs.

Main Methods:

• Fifty-eight dogs were assessed, with 36 diagnosed with ADHD-like behaviors using physical, behavioral, and validated owner-reported scales (C-BARQ, Dog Impulsivity Assessment Scale, Dog-ADHD rating scale).
• Serum samples were analyzed for serotonin and dopamine concentrations using ELISA tests.
• Statistical analyses included Kruskal-Wallis tests and Lasso regressions to correlate neurotransmitter levels with ADHD-like behaviors.

Main Results:

• Dogs classified as ADHD-like exhibited significantly lower serum concentrations of both serotonin and dopamine.
• Lower levels of serotonin and dopamine were associated with increased aggression, hyperactivity, and impulsivity.
• Decreased serotonin levels were also correlated with fear, attachment issues, and touch sensitivity.

Conclusions:

• A strong relationship exists between serotonin and dopamine levels and ADHD-like behaviors in dogs.
• Neurotransmitter imbalances, specifically reduced serotonin and dopamine, may play a role in canine ADHD-like symptomatology.
• These findings support the use of dogs as a valuable model for understanding ADHD pathophysiology.