Please don't panic, but yes, you should seek medical attention promptly. Even a light scratch from a stray dog carries a risk of rabies transmission if the skin is broken, even slightly. First, immediately wash the scratched area thoroughly with soap and running water for at least 15 minutes; this is a crucial first step to reduce the risk of infection. Afterwards, visit a doctor or a local clinic as soon as possible. They will evaluate the scratch and likely recommend starting the post-exposure rabies vaccine series. Rabies is highly preventable when treated early, so getting evaluated quickly is the safest choice.