how i can load Module bcm2708_wdog
At first I thought you were looking for the wrong thing because of this:
Linux raspberrypi 4.4.7-v7+
Since this means you are using a Pi 2 or 3, parts for which are sometimes referred to as "2709" instead of "2708". However, as far as I can tell, the watchdog module has the same name for both of them:
sudo modprobe bcm2835_wdt
And there are no
wdog aliases defined either.
There is a lot of (older?) documentation online referring to the module you are trying to load though. Perhaps something changed at some point, or that was built into the kernel.