The best replacement for watchdog is guard dog.

The best alternatives to watchdog are rated as following:
★★★★★  guard dog
★★★  advanced task killer
★★  bloodhound
★★  checkmate
★★  watchdog
★★  lifelock
★★  task killer
★  ico
★  ace in the hole
★  lapdog
★  guarddog
★  onavo
  mobile spy
  netcounter

Your alternative for watchdog is not listed? Suggest!
Speaking about watchdog, one probably shouldn't forget about marine battery.

Other search terms related to watchdog and their ratings are:
★★★★★ marine battery
You have in mind a companion for watchdog and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of watchdog in all years. Click on graph for more.
watchdog
guard dog
advanced task killer