Not letting children look at pictures of non-kosher animals. So much for the flags of the shevatim and bringing them to Ashkenazic shuls (pictures of lions as well as the flags). I knew a talmid of Rav Scheinberg who decided to be makpid so he asked his parents not to bring such pictures as gifts at the bert. When the gifts were opened it was discovered that Rav Scheinberg’s wife gave pictures of bears.
As for walking between two women ,some say it is immodest. Not walking between two dogs or pigs is probably safer. BTW, just because something is mentioned in the Gemara does not necessarily mean that we pasken that way. A case in point is not leaving eggs, garlic or onions unpeeled overnight (see “The Weekly Halachah Discussion”, v.2 p. 460 ff.)