This is the blood vessel and is as far as you can go. If you reach the blood vessel and the spur is still too long then you will need to wait a few weeks for the blood vessel to withdraw a little from the end of the spur before trimming again. Using the file, you can round the edges of the spurs off to make them neat. If you trim too far, the spur will bleed and it will be very difficult to stop bleeding (just like dogs nails). You may want to consider buying a Veterinary Caustic (Silver Nitrate) Pencil.
Most states classify a standard DUI (or DWI) charge as a misdemeanor. Certain circumstances can raise the level of the charge to a felony, however. A conviction for a felony DUI carries stiffer penalties and more lasting consequences than a misdemeanor charge.
Typically a OWI/DUI is a misdemeanor but can be turned into a felony if there are previous charges within the past five years. Felony charges can also be filed if there is a passenger in the car under the age of 18 or the offense caused serious injury or death.