Fur color changes

My puppy is 8moths old. Back in early or mid April her brown fur started to get darker brown spots on it. There are spots on her sides and the whole middle of her back is a darker brown than the rest of her. I was just wondering is this normal being that she's getting older? I've uploaded some pics. Any help or advice would be great. Thanks in advance :).

Hello!  There are some seasonal coat changes that happen to dogs, but it is good idea to ask the vet to take a good look at this case.  With or without a yeast infection present, coat changes like this can signify hormonal diseases including ovarian-related problems and endocrine disorders, so it's well worth taking them seriously.