Is there a limit to how many letters and spaces a pet name can have? If so, how many?

Only one space in a row. No Mark James. Only Mark James. But no idea if there's a limit.

I'm pretty sure that your only allowed 15 characters per pet, and no nifty characters anymore either. As for spaces, one space in a row. Two spaces will default to one space.

30 is the maximum length of a petname, spaces included.