How old is your pup?
If a vaccine is given after the immune system is fully mature (about 6 months), you only HAVE to give one or 2 sets. Since maternal antibodies are interfering and the immune system isn't mature, you need to give between 2 and 4 sets (usually 3).
The most common schedule is probably 8, 12 and 16 weeks but different vets have different schedules.
Starting before 8 or 9 weeks is really not a good idea.
Rabies should be given at late as possible.
If your pup really only did get one round of DHPP, I think I'd find a new vet or ask for a looooooooooong explanation...
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