Accusative is the only case where it is important whether a masculine noun is animate or inanimate.
If it's animate, the Accusative form looks the same as the Genitive form. "Lubię tego psa. Nie lubię tego psa."
If it's inanimate, the Accusative form looks the same as the Nominative form. "Ten zegarek. Widzę ten zegarek."
You have to also remember that many food articles, especially fruit and vegetables, are considered grammatically animate, although there isn't really any logic to it.