Probably this question has been asked more than once before. But still. The question is meant from both an in-universe and an out-of-universe perspective.
1) (In-universe): Are Tosk and the hunters part of the dominion, and if so, how do they fit in?
2) (Out-of-universe) Was the creation of the Jem'Hadar concept inspired by Tosk? We see several elements in Tosk that we see in the Jem' Hadar later: living for only one purpose without distraction: to die honorably, needing virtually no sleep, needing no food in a conventional way, the capability to make himself invisible, etc...
1) (In-universe): Are Tosk and the hunters part of the dominion, and if so, how do they fit in?
2) (Out-of-universe) Was the creation of the Jem'Hadar concept inspired by Tosk? We see several elements in Tosk that we see in the Jem' Hadar later: living for only one purpose without distraction: to die honorably, needing virtually no sleep, needing no food in a conventional way, the capability to make himself invisible, etc...