I had two that were slower and a lower faint sound . There was the one on the left that was alone and that heartbeat was superfast and loud. I was always able to find that 1 heartbeat and tell it apart from the others.
I bet,well almost positive gut feeling that the one that I heard loud and fast is the one surviving puppy that we have now! I wish I could have witnessed the natural whelp instead of a c-section. All I know is that the vet told me there were were two that came out weak and 1 dead and the last one was alert and screaming the whole time lol.
I bet that was our Lucky boy
Genie,Cookie,Lola,Angel & Lucky