In to'resk society marriages are more business agreements.

I believe the answer is yes you can include a dowry in a marriage contract if you want but its probably tribe specific or class specific. Something nobles would do

It's not really just for nobles to benefit from, if they chose to add it as a clause.

Being something 'nobles would do' doesn't mean it'll be mechanically added, it could always be done as a 'donation in trust' by players without an actual mention of it in the contract.

What I'm specifically inquiring about, is regarding the official contract, having the possibility to include it.

Large farming families for example, may want any of their potential heir's suitors, to provide livestock/grain/produce, toward their lively hood as well. Put something to the 'family business' so to speak.

For nobles, it could be a something as simple as a transfer of wealth to cement the alliance.

Really hope something like this could be arranged. A dowry with a purebred horse between two Neran would be very symbolic. As would a wolf with a Brudvir, or Pigs with Dras/Toresk