How old do you think my dog might be?

Jessica • 25 and trying to get my life on track and grow up a little more! Step one: understanding and taking care of my body!

My husband and I adopted our dog on December 5th and we were told he was about 2 years old and a terrier mix (though I'd say he looks like a chihuahua mix personally).

So if you look at the pics below, the first one is from late February and the second picture is from tonight.

Do you think these might be age spots? They aren't raised or dry, just normal skin that started to change pigmentation a couple weeks ago. I'm starting to think maybe he's much older than 2 now...

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