I would say this deer is either 3 1/2 or 4 1/2...it's hard to tell about the very back tooth.

The 1st molor is too developed and worn to be 2 1/2.

If the very back tooth is flat it's 3 1/2...if it's worn at a forward angle it's 4 1/2. The 2nd picture looks like 4 1/2 to me.