Not a good idea. The hair will grow in stiff. I made the same mistake with my peke.
If you have hot Summers, Yes, Unless your dog is an Inside Dog, Then it is Ok. Maybe a Haircut is better than a full Shave, Though. You should get it Professionally done.
ya yo should shave thier butts!
I had my peke groomed, because even inside she would get to hott, and then sick. So I will keep her professionally groomed and buy her a coat for winter. I think it really depends on your peke