NeuroFeedback 2.0 is an AI-driven neurofeedback system that integrates human and animal brainwave data to deliver personalized, real-time cognitive training. Leveraging a dynamic knowledge base powered by graph databases and federated learning, the system adapts protocols based on EEG, EMG, and HRV biomarkers while preserving privacy. The hardware includes the BrainBit headband (dry-electrode EEG for humans) and Callibri strap (fur-compatible EEG for animals), both optimized for low-latency edge processing. Cross-species ontology enables shared insights, such as pairing human relaxation protocols with canine anxiety reduction. The cloud AI layer refines recommendations using explainable AI and federated updates. Applications range from ADHD and PTSD management in humans to behavioral training for pets and performance animals.