ok i came up with a theory and im wondering if anyone has tried this so i can get some take back on the situation
ok so this theory is mainly focused on cross breeding non traited meeroos whoses parents where the initial carriers of the traits

Meeroo A - Non Traited Autumn
Meeroo B - Short Eared Autumn
Meeroo C - Offspring of Autumns A and B non Short eared Autumn
Meeroo D - Sierra Short tail
Meeroo E - Offspring of C and D Autumn normal hidden carrier of short tail and short ear

ok so far this is what ive done wondering if continuing would be benefiting or just a waste of time mainly
i have Bred A and B to produce C which should passively carry the short ear gene.
i have bred C and D which now produced Meeroo E which should passively carry both Short ear's and Short tail gene if continuing this path i feel the need to Breed Meeroo E with Meeroo B which would mean the same short ear gene is carried on both sides of the fence which should give a better chance to produce another Short eared autumn in theory once that baby is born i will Breed that baby with Meeroo D to add another short tail gene into its bloodline and continuing this path by back breeding back to C and back to D i have a feeling that the produced meeroo would come out with Autumn coat more then likely aswell as Short ears and Short tail im not sure if anyone has tried this method but it seems very logical when written down on paper that the ending meeroo which carries both solid showing traits short ears and short tail would pretty much have so many short ears and short tail genes in its bloodline that it would be a constant producer of both genes thus hoping for a genetic mutation to have occurred by the inner breeding of multiply crossed bloodlines into something different coat wise in this mix but as to not knowing which coat colors would be the more dominate its kind of hard to predict such to happen so it would mainly be just a shot in the dark to see if this could and will have occurred

sorry for the huge block of text in advance just theory crafting and trying to draw some take to see if anyone can help me put fact to this theory