Oscar S. Goins, proceeding pro se and in forma pawperis, appeals the dismissal, for lack of subject matter jurisdiction, of his complaint against Allstate Insurance Company, Mike Ortego, and Willie R. Goins. Goins does not challenge the district court’s conclusion that he failed to show diversity jurisdiction or present a claim arising under constitutional or federal law. Because Goins fails to challenge the reasons for the dismissal, any contention is *108 deemed abandoned. See Brinkmann v. Dallas County Deputy Sheriff Abner, 813 F.2d 744, 748 (5th Cir. 1987).

Goins’ appeal is without arguable merit and thus frivolous. See Howard v. King, 707 F.2d 215, 219-20 (5th Cir. 1983). Therefore, it is dismissed as frivolous. See 5th Cir. R. 42.2. Goins is warned that future filings of repetitious or frivolous appeals may result in the imposition of sanctions. These sanctions may include dismissal, monetary sanctions, and restrictions on his ability to file papers in this court and any court subject to this court’s jurisdiction.

APPEAL DISMISSED; SANCTION WARNING ISSUED.