Ok yes that is fair--with such heavy wear and old corrosion, it is very hard to pick out enough detail to identify the animal with any certainty. I was asking because it seems to me (as a non-expert) that there are way more horses pictured on coins than goats (or deer, I think). That plus, the front limbs of the animal vaguely seem to be positioned like it is running.
Added: For sure the portrait of Demeter seems pretty close the examples of Aigospotamoi AE that I am seeing over on acsearch so maybe you are right. Of course that doesn't explain the lack of inscription above and to the right of the goat plus the seemingly off denomination.

"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz