We were detecting along the Delaware during low tide under the Betsy Ross bridge in the 90's (when you could just walk back there).

Two dogs came out of nowhere and blocked our exit along the beach (you have to jump down to get to the beach).

They stood above us growling. We had plenty of rocks if we needed them but we just waited for them to leave.

A lot of people walked their dogs back there without a leash so I knew it would be just a matter of time before the dogs would scare and leave.

I guess just be careful for two and four legged danger wherever you go.