If memory serves, the way you do dual-boot with Win95 and DOS is you first install DOS, then Win95, then during boot, right after the BIOS tries to hand off control to the OS, you press and hold F7 or F8 (forget which) and you should get a message along the lines of "Starting your old version of MS-DOS..."
This might only be a Windows 98 thing, as I recall doing this all the time with Win98, but I never had Win95.
Two important things to keep in mind when dual-booting with DOS though:
1. Depending on the age of the system there may be IRQ conflicts which normally would be sorted out by Windows, but which DOS can't handle. When I had to replace the motherboard in my Win98 system I put in an SATA HD as well, only to discover that my SATA controller and PS/2 mouse support were using the same IRQ.
2. DO NOT PARTITION TO FAT32. If you do this and attempt to read/write to a FAT32 drive using DOS 6.22 or earlier, you're in trouble... Do not allow a pre-Win95 version of DOS to attempt to access a FAT32 partition and make sure it can only access FAT16 partitions.
--- Kris Asick (Gemini)
--- Pixelmusement Website: www.pixelships.com
--- Ancient DOS Games Webshow: www.pixelships.com/adg