I agree its not normal for a yorkie to get hypo at 2 years old but its not unheard of. Bella gets low after a bath...when she gets chilled she seems extra sensitive to low blood sugar. SHe also gets low if she is in a stressful situation like car ides....I always bring the nutrical with me when going bye bye. She has only had 2 episodes where she showed major symptoms, the others were a lil shaky and lethargic so its not a huge issue but one to be aware of and be ready for it. Oh I forgot I had also put frontline on her and given her interceptor. SO that mayhave caused it too...now i never give 2 things in the same day so i can pin point what it is. I agree keep and eye on her and I hope she has no more episodes!