Not all dogs are rabid dog .. you can only get infection from rabid animal

Rabies is not transmitted just by feeding dogs and not every dog has rabies, It can be transmitted by bite of an infected dog or by contact of saliva with mucus membrane or open wound. If that's the case then u need to get post bite vaccinations otherwise u don't need to worry!

Not all the dogs have rabies. Rabies spread from infected dog saliva to a bleeding wound. If the dog has rabies, then it will have excessive salivation, and they can eat or drink (may or may not be aggressive). In your case, you just fed a stray animal. Until you got a bite or touched the saliva in the bleeding wound, there is nothing to worry about. If you still want to go for testing or want to get more details, then reach out to Pasture Institute. They can help you. 

One shpuld follow standard  operating procedure while handling a dog.

Just relax don’t worry about it . Did you find any abnormal behaviour of dog ? And if you are tensed about it so you can just get an anti rabies vaccine for your satisfaction . And if you notice any sign and symptoms then visit near by hospital.