I am therefore unable to provide any systematic evidence of disease increase or decrease, but I recognise animal rescue charities concerns when they become aware of dogs that are affected.
Ni does gennyf felly dystiolaeth systematig bod y clefyd yn cynyddu neu’n lleihau, ond rwy’n cydnabod pryderon elusennau anifeiliaid sy’n dod i wybod am gŵn sy’n dioddef o’r clefyd.