Full Tilt Poker
Pot Limit Omaha Ring game
Blinds: $0.10/$0.25
6 players
Converter

Stack sizes:
UTG: $24.10
UTG+1: $8.35
CO: $22.95
Hero: $24.65
SB: $9.50
BB: $29.20

Pre-flop: (6 players) Hero is Button with K A A 9
UTG calls, UTG+1 calls, CO calls, Hero raises to $1.6, 2 folds, UTG calls, UTG+1 calls, CO calls.

Flop: 9 K 8 ($6.75, 4 players)
UTG checks, UTG+1 checks, CO checks, Hero bets $6.75, 2 folds, CO raises all-in $21.35, Hero ???

My 3rd hand at the table, so no reads. I can't see KK, 99, or 88 checking that flop. Most likely a straight/flush draw? I know I'm most likely ahead right now, but is it right to call knowing I could still be a slight dog?

I probably check flop, or at least make a smaller bet. As played, I fold to his raise.

You could be a giant dog to the right kind of (very plausible) hand

http://twodimes.net/h/?z=3013158
pokenum -o ah 9s as kc - tc jc qh kd -- 8c 9c kh
Omaha Hi: 820 enumerated boards containing 9c 8c Kh
cards win %win lose %lose tie %tie EV
As 9s Kc Ah 278 33.90 542 66.10 0 0.00 0.339
Jc Tc Kd Qh 542 66.10 278 33.90 0 0.00 0.661

Or, heaven forbid....
http://twodimes.net/h/?z=3013167
pokenum -o ah 9s as kc - tc jc ks kd -- 8c 9c kh
Omaha Hi: 820 enumerated boards containing 9c 8c Kh
cards win %win lose %lose tie %tie EV
As 9s Kc Ah 33 4.02 787 95.98 0 0.00 0.040
Ks Jc Tc Kd 787 95.98 33 4.02 0 0.00 0.960

BZZZ. Wrong answer. Checking the flop is terrible here as it's extremely likely you have the best hand, but there are still a ton of weak draws that could hit against you. Anyway, I like the pot-sized bet and with CO this short, this is an automatic call. He could easily have something like a pair and an open-ender that he didn't feel comfortable betting into a large field but decided to get in with once he realized you were heads-up.

I lol'd.

C/O isn't "short" , it's just that the pot is so big. We're playing for a buyin here.