Our Golden Retriever was 2 years old in June of this year. When, or if, he shed last summer I could hardly tell. This summer, however, he has shed most of his hair, which was about 4" thick. There is still enough left to cover him nicely, and the skin is a nice pink, clear of any scaliness, etc. Is this normal for Goldens, and if not, what could be causing it? I know that low thyroid will make the hair fall out, but that also affects the skin and has a certain odor. This dog seems completely normal otherwise. Thank you for any thing you can tell me about this.