No not a dew claw!
I asked the vet about this when my 2year old bitch was a pup and he said to keep an eye on it, didn't seem worried.
So I haven't worried either but I'm interested and I haven't found a similar case on searching the net.
She has an extra claw on her front right paw and it comes out of the side of the right toe pad and is upside down, it turns upwards. I trim it when it gets long, keep it trimmed flush to her pad.
Anyone seen anything similar on a lab? Should I get a second opinion from another vet?
The bitch is from a working strain, came from nr Dent Cumbria.