I came home from work today and saw that one of my two ( Most likely Colt ) has either eaten or nibbled down half of a pumice stone!!! I don't see any pieces of it so I am assuming he/she ate it!! They are both acting normal! They got it out of my husbands walk in shower... he left it on the floor of the shower obviously

Any ideas? I know to look out for lethargy and constipation..do you think they can pass it? I am also assuming its very small pieces... Grrr I am so mad I could screammmmM!!
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"No man can be condemed for owning a dog. As long as he has a dog, he has a friend;
and the poorer he gets, the better friend he has."