Hi, Last Saturday I Noticed A Small Wound On My

hi,
last saturday i noticed a small wound on my foot. the only thing i remember is i stepped on my puppy later that morning. however I am not really sure if it had bitten me. it's been 5 days passed, but now i am worried if it was really a bite. not sure about it.

last march 2012, had two shots of verorab. do i need to have a shot eventhough i am not sure if it was a bite and it was 5 days passed. pls pls answer. thank you