Brindle is a marking:

https://wolfplaygame.com/genstart.php?decor=Y&id=2144937&tm=1561320883

Your wolf, <font class="mainlineblack">Sarya also has this.

If one parent or both have brindle marking, the pups have a chance to inherit it though it's not a guarantee. Find a brindle male to breed to, or breed Sarya.

This is a brindle wolf, made it white on a blue color coat so you can see it well

https://wolfplaygame.com/genstart.php?bgpic=9&shadow=Y&sex=M&base=40&rank=A&piebald1=0&legtype=0&tailtype=0&pointscolor=0&brindle=1&eyes=6&muzzletype=0&muzzlecolor=0&headtype=0&ears=0&shoulder=0&backtype=0&backcolor=0&speckletype=0&specklecolor=0&eecolor=0&eetype=0&nose=0&okapi=0&leopard=0&decor1=0&gear=0&harl=0&bel=0&som=0&pietype=0&alt=1

The best way to get one I'd say is breeding a male and female with a brindle pattern together

is this a brindle wolf? https://wolfplaygame.com/wolf.php?id=3220591

Yes.