Or some other stallion was out having some fun about 11 months ago. Could have even been a ungelded yearling, 10 month old, 2 year old etc. it happens!
If the sire was palomino, dam is chestnut, bay is genetically impossible. Absolutely no way, no how.
Pull some tail hairs, send it in for base color testing. If it comes back that he isnt e/e, you have been absolutely 2000000 percent lied to regarding who the sire is.
Regarding what the vet said about one 'popping up every once in awhile' well...I bred my chesnut mare to a grulla. And my vet said 'oh, you could get a palomino!' and was very adament about it. But no, you could not get palomino because neither sire, nor dam, carries any sort of cream gene.
And the reason why they 'pop up' is due to a mare being bred by another horse and the owners not knowing or too irresponsible to realize their ungelded yearling can indeed, use what he's got.
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