Same problem but mine are eating the Linoleum.
Since I have 5 it hard to say who is doing it..
When I say who did this ..they all look guilty..
but I think it is one of the younger girls.
A teething thing
I take a fly swatter and slap the floor area and tell them NO..bad dogs..
I had to do it several time but they are starting to leave it alone NOW..thank goodness.
I have a lab that when she was young ate a chunk out of the wall.
Sherry