TL;DR more plants, more animals, more uses for both
Horticulture:
Definitions:
Massive
Mammoth, Dragon etc. drops 6 food, good luck killing this
Large game
Bears, Cows etc. drops 4 food, very high health pool
Medium game
deer, wolves, sheep, etc. drops 2 food, can take a few hits
Small game
birds, rabbits, foxes, etc. drops 1 food, likely to drop in one hit
Placid animals
most likely will flee when attacked
Territorial animals
will attack you only if attacked, or you get too close (maybe not this considering 2d game), they do not pursue if you flee
Aggressive animals
all most always Carnivores these will attack you on sight and pursue you indefinitely
Animals:
Wolves
these are a Territorial Medium Game Carnivore, they spawn in groups of 2-5 at a time, can be domesticated as a hunter animal, while wild they will attack other animals
Cows
These are Placid Large Game Herbivore, that will either flee (ranged), or fight back (melee), when attacked, they spawn in groups of 1-5 these can be domesticated as work and production animals
Sheep
these are Placid Medium Game Herbivore, they spawn in groups of 4-8, these can be domesticated as production animals
Horse
I feel I would be lynched if I did not mention horses, these are Placid Medium Game Herbivores, much like cows they will fight back if attacked in melee, they spawn in groups of 3-6, and can be domesticated as either work or hunter animals, uniquely when put as a hunter they will pair with a soldier or archer, and become a mounted version of either, increasing damage, health, and speed
Mammoth
this Massive creature is cumbersome and dangerous, even though it's Placid, dealing damage to near by buildings as it passes, Soldiers can deter it, and if you can surround it you might even be able to kill it, if you deal enough damage it will become enraged and fight back, BE READY FOR THIS, they spawn in groups of 1-3, and cannot be tamed
Bear
be careful of caves, as many are home to these Large Aggressive creatures, if season are ever implemented they will hibernate during winter, but this does mean they are easy picking, it just your best chance
New Buildings:
Stables
this structure, requires 4 cut lumber, 4 bricks, and 8 grass to make, and allows you to tame creatures, consumes grass/food (herbivore/carnivore) and water, produces poop when it has any animals inside, after animal has stayed for a time they become domesticated, later levels, this can breed domestic animals instead (very very late game)
If it has a production animal it inside it takes 3 grass and 2 water, with Cows producing milk and poop, with sheep producing wool and poop, instead of it's normal drop
upgrading will allow for it to house two villagers, and two different production animals, or production and taming, upgrading requires 2 metal, 2 brick, 4 grass
when it gets dark all work animals will return to the stables
Existing Buildings:
Farm
after the first villager is place these can accept work animals, when a work animal is attacked the farm requires 1 less poop then normal (this is assuming that later poop requirements may increase), the animal will not poop while it is attached, but be careful they can still be attacked
Carpentry
after first villager is placed these can accept work animals, work animals will go out with gatherers, and act as a drop off point until full, then return to the nearest shrine or silo
Archery
Can accept hunter animals, in addition to villagers, while hunting animals are here they will get hungry like any other villager, and occasionally poop
hunting animals will stick with archers attacking their targets, both day and night
Barracks
can also accept hunter animals, works like the Archery