Ok so the first time I read the post was from my ipod and the pics weren't in the post. So now I have looked at them. The second one looks like the brown oval shape at the base of the crown on the right side of the tooth could be something called cervical decay. It is a shallow hallowing out, usually yellowish in color on a human tooth and looks similar to your pic. Hard to tell without being able to touch it. On your picture it could also be calculus(if the area is raised) but if it is depressed there then most likely it is decay. It doesn't have to be brown or black it can be yellowish in color. In humans it can start by grinding actually then the area gets exposed and decay can form. Hope that is of some help.
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Mary
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