If you already own 100 shares
Income call
For income on ZTS you already hold: sell the Oct 16 $80 call and take $70 now. If ZTS climbs to $80 by Oct 16, your 100 shares are sold at $80, so only do it if you're happy selling there.
If it climbs past $80 your 100 shares are sold at $80 and you keep the $70. That is the trade working, not a loss.
The call order
ActionSell to open
ContractZTS Oct 16 $80 call
You get$70 (limit about $0.70)
If it climbsYour 100 shares sell at $80
Close earlyBuy back at about $0.49 ($49)
Chance your shares are soldabout 19 in 100
After removing the trend-4% a year