I had gone to my friend's house last week at night. Since there was no light, I stepped on his puppy. He cried a bit and hit me with his hand on my lower. I felt his soft claw. After I came back, he flee away so I didn't see him. After 2 days, I became anxious, what if the dog was a stray dog that entered in the house not his puppy (highly unlikely since the door was closed and my friend said it must his puppy as he usually sleeps anywhere) and he might have scratched me (but I didn't feel any pinch). I checked for wound and my lower (neither the lower was torn nor there was any wound there after two days). Do I need a injection or I am just over thinking (i always think like that)?