I don't know much about breedfile hexing, but maybe it's something wrong with scales and sizes. Do you have any variations there?
I'm not really sure? I've never dealt with variations when hexing, so I'm not sure what to look for. These are the only mentions of male/female variants I see. I'm not sure if this is what I should be looking for or not. lol
The problem is you've got an extra empty line in the code for your default scales:
[Default Scales] #2.B ;male 150 137
#1 ;female 150 137 ## So the game thinks the code for the default scales ended after the male variation section and it's just assigning the adult female variation with some "internal" default scales (which is why they look a lot more dog-size)
Just delete that extra line so it looks like so:
[Default Scales] #2.B ;male 150 137 #1 ;female 150 137 ## Or, since male and female have the same scales (and if you're not planning on changing them), you could delete the variations like so: