Certified Applied Animal Behaviorist (CAAB) and Professional Dog Trainer (CPDT-KA) with 18 years of field experience. He specializes in modifying complex behavioral issues such as aggression, separation anxiety, and reactivity in working breeds and rescue dogs.
Marcus O'Connell is a highly respected behaviorist who applies the science of learning theory to real-world dog training. Having spent nearly two decades working with high-drive breeds and traumatized rescues, he focuses on the psychological roots of behavior rather than just symptom suppression. Marcus is an expert in desensitization protocols, impulse control, and decoding subtle stress signals before they escalate into bites. He teaches owners to differentiate between "stubbornness" and lack of clarity, advocating for force-free methods that build trust. His articles provide actionable blueprints for everything from crate training and socialization to managing the difficult "teenage" phase, ensuring safety and mental enrichment.