Medical advise for a street dog

Namaskara, So there is this street dog which comes to our place every morning and only has Parle G biscuits and nothing else(baari diet conscious lol). Over the last couple of days he doesn't eat anything and just sits in front of our place for few hours and disappears until he rocks up the next day. I believe he requires medical attention as he seems to have lost weight and seems tired. Any vets we can call around who could visit our place and see this guy? Or anywhere I could report this to? Any suggestions welcome.