From Season 1 Episode 9 : Timestamp 04:20

Julian : What is the meaning of your son's name ?

Dorothy : It does not mean anything. Its just a great name.

Julian : I think you may have condemned your son to the life of the collar  ?

What does that sentence mean  ? What is "life of the collar"  ?

From Servant S01E09: Timestamp 04:20

Julian : What is the meaning of your son's name ?

Dorothy : It does not mean anything. It's just a great name.

Julian : I think you may have condemned your son to the life of the collar?

What does this phrase mean? What is "life of the collar"?