I was wondering if someone could tell me what a good weight for a 1.5 year old male creastie is? My smeagle weighs 39-40 ( his weight goes between 39 and 40 depending on how much he ate that week- he is weighed wkly). I bought the creastie book and it said that they can go up to 60 grams but most are smaller. They wasn't specific about how much saller. I worry that he is under weight. Thanks