I Built an AI That Reads Your Pet's Body Language — Here's the Exact Tech Stack

Your dog pins their ears back. Your cat flicks their tail. Most pet owners miss 80% of what their animals are telling them — not because they don't care, but because we were never taught the language. I built MyPetTherapist to fix that. Here's the full technical breakdown of how we use AI to interpret pet body language from a single photo. The Problem Worth Solving Vets see your pet for maybe 20 minutes a year. In that window, anxiety, pain signals, and behavioral red flags often stay hidden — pets mask stress in unfamiliar environments. The real behavior happens at home, and it's invisible to professionals. The question I kept asking: what if a phone camera could become a 24/7 behavioral observer? Architecture Overview User uploads photo ↓ FastAPI backend ↓ Vision model (GPT-4o) — keypoint extraction + behavioral inference ↓ Structured JSON output ↓ Report generator (species-specific templates) ↓ PDF/HTML delivery to user Simple on paper. The complexity lives in the prompt engineering