Dog's skin turning black

[kdp81]

I have a 4 year old chihuahua who has always had nice pink skin. I went to Europe for the summer and my wonderful in-laws took her to the 'burbs for three months of long walks, lake swimming and sailing. When we were reunited earlier this week the first thing I noticed was that her skin had darkened by several shades! Her belly is now a charcoal color and her ears are dark as well. Could it just be a tan? She is normally a city dog but definitely spent a significant amount of time outdoors this summer. I am worried it is something more serious but nothing else is wrong with her...same energy level, eating and drinking, sleeping...
Any thoughts would be greatly appreciated!

[haidee]

i think its something to do with getting used to the climate or something

[Mandapanda17]

I noticed my dogs tail turning black under his fur, glad to know its somewhat normal? I was worried too.

[haidee]

Hi

Im not 100% certain but i can tell you my parents live in spain they have two dogs and exactly the same happened to them and the vet told them not to worry it was quite normal

[kdp81]

Also want to add that it is not dirt - she has been scrubbed :)