Does it matter if a 30A dryer is plugged into a 30A outlet through a 50A pigtail?

Does it matter if a 30A dryer is plugged into a 30A outlet through a 50A pigtail?

for USA, Canada and countries running a 60 Hz power supply service.If the current draw through the circuit is less than the rated current of the circuit then there is no problem. In this case if it is a 30 Amp dryer
fed through a 50 amp outlet on a pigtail that has a 30 Amp plug
plugged into a 30 Amp outlet
on a circuit protected by a 30 Amp breaker
No worries!
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It is wise to place an over-current device (fuses or circuit breakers) in your pigtail, though.
-EDIT- Only if it's a 50A outlet. If you have 50A wiring on a 30A breaker you are quite safe.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.