Abadar, the LN god of wealth, trade, cities, and nobility has his sacred animal listed as a monkey (and previously an eagle back in the 3.5 days). While the intelligence of monkeys is certainly something Abadar would value, I don't think the mischievous and flighty monkey to be the best fit for such a disciplined and reserved deity.
Inspired by Abadar's CR 4 divine servitor from Inner Sea Gods, the orsheval (think an iron horse), I think the better fitting sacred animal is the horse. Its a land animal which fits Abadar's Earth domain, its used for travel, its a pack animal making it indispensable for trade, and its often associated with nobility in the medieval world.
Ultimately this is just a small flavor change, as I don't think there are any game mechanics that involve sacred animals, but I think its fitting.
And don't get me started on Irori and the snail...