I have a yorkie-poo, she is about 5 months and almost 5lbs. Im afraid she's going to be a beast! haha. I would like to know if anybody knows how big they usually tend to get..and how to determine their weight..i hear your supossed to double the weight at 3/4 months and that's what they usually are? It's all new and confusing to me.. I've searched online and can't find much info. I figured maybe one of ya'll can help me out!