You can split the difference between the .45 and 9mm and go with a .40 S&W. It would probably work on cougars. A sub-compact springfield XD or a sub compact Glock would probably fit the bill.

I also think the revolver in a .357 mag would be a good choice. The lighter recoiling .38 special's would be easier to shoot.

Seattleduke said it best, you should go to the range and try some out.