I can fly from Columbus for $99 each way at times, but you have to wait for certain times of year. So let's add it up.
$200 round trip per person X two= $400

Leave the wife behind. There you just saved $200

3 or 4 days of boarding the dog= $80

The wife can take care of the dog. There you just saved $80

2 days of lodging in Vegas= $160

You can stay for two nights in Vegas for much less. You can save $100 right there.

3 or 4 days of food........... = $200

Without the wife reduce that to $100

Total without gambling.........= $360

Now think of all the extra money you'll have to gamble with.