I just took my cat Merlin's BG before giving him his evening injection and his BG is 161. Does that mean I should NOT give him his evening injection or just to do a lower dose? Thanks! Note: We just found out last Friday he is diabetic, caused by steroids. He is on 3 units of Lantus twice per day. I just got a BG monitor to do testing today. Morning dose at 10 am - 3 units. Testing blood 6 hours later and BG was 100 (his first at home test). Now it is time for evening shot and his BG is 161.