I have a 6-month-old puppy Boston Terrier that recently developed about 10-15 freckle/mole like, round, spots on his lower abdomen (looks like more are coming). They're dark in color but still transparent (if that makes sense). He's also developed two larger (half the size of a penny) moles (?) but darker then the other ones on the tip of his penis. Does this sound like normal pigmentation changes or something I should be concerned about?