Horse and dog sacrifice.

 A couple of quotes:

Some of the earliest ritual evidence cited is the horse skull from Dereivka which was accompanied by the forelegs of another horse and the remains of two dogs. This evidence has been interpreted by those who see it as a ritual deposit as an example of a "head and hooves" cult, i.e., where the head and hooves of the animal were mounted upright on a pole
--EIEC, "Horse", p. 279.

... four proud horses did he then cast upon the pyre, groaning while he did so. The dead hero had nine house dogs; two of them did Achilles slay and threw upon the pyre
--Iliad  xxiii (Butler translation)

Two dogs, as well as horses, as a funeral offering, both at Dereivka and at Troy.

I make no further comment except to say this is very interesting. It's something very Indo-European -- and persistently Indo-European.

Mark.