The Watchdog mechanism is not suitable in MANET and WSN, because of high false positive and unreliable observation mainly due to the collision.
We published a paper to demonstrate these issues, and we proposed another version for IEEE802.15.4 with beacon-enable mode based on a classical Watchdog. You can find downloaded version here: https://hal-upec-upem.archives-ouvertes.fr/hal-00620375/file/Monitoring-15-4.pdf