
By 3 months is it about 12 to 15 weeks. They lose all their coat at this time and get a mask on their face which most of us call the monkey stage!! It could be just that it's about to change its coat. They look absolutely awful at this point.
When you say its lost all its hair is it bald or has it just gone really short?
Take it to the vets to make sure that it hasn't got any problems. I wish you all the best.
Regards.
Diane