The Argentine midfielder was dismissed for a second bookable offence after making a small jump into a tackle with Leandro Bacuna but winning the ball cleanly.
Pulis slammed regulations barring an appeal.
"The biggest disappointment about this decision is that it's two yellow cards and we can't then appeal and I find that disgraceful," he said.
"It is absolutely shocking, you can get a red card and appeal but you can't appeal on two yellow cards. I find it absolutely amazing."
Asked if he would write to the Football Association, the West Brom head coach replied: "You're joking."