Mammary tumor in a fourteen year old Labrador Retriever. The tumor is about eight centimeters in length.  It was confirmed to be a carcinoma on histopathology.
<a href="//commons.wikimedia.org/wiki/User:Joelmills" title="User:Joelmills">Joel Mills</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>