@Jill, once you spotted on the
Dogs thread that the set 3 here presented is from a Wild Republic tube.
I opened a page on TAW for them.
I don't know if I am seeing it well but the tube number seems to be
#63241. Does these horses are also numbered on their belly?
I suspect this tube is from 1998 once many new tubes were added to the range in that year what coincides more or less with the Play Visions and Club Earth ones.