Puppy 4 works well on a wide range of computers and may perform better than Puppy 5 on older computers.
- Puppy431 - last official version of series 4
- Puppy430 - superseded by 431
- Puppy421 - superseded by 430
- Puppy440 - community version, final version never released
- Puppy432 - non-official, enhanced edition of 431
- Puppy421 Multiuser - Multi-user version of