Like Salt on a Margarita Glass

OK, I have to admit that I probably don't wash my dog's food bowl as much as I should, but I think the dirtier it is - the more my dog, Bianca, likes it.  It gets real crusty at the top edge of the bowl, so before she starts eating the food - she licks the crusty part around the rim and then dives in.  She must have loved Margaritas in a past life.  I think I'll try putting some salt on the rim and see what happens.  I hope she doesn't get upset when she dives in and there's not a margarita there!