With this mod the creatures of Skyrim will all be bigger, stronger, and faster. 

The land of Skyrim is reminiscent of the last ice age and the creatures not unlike the megafauna that lived at that time. 
No longer will you be able to walk through a pack of wolves and expect no danger, the beasts of Skyrim can and will kill you. The monsters are more monstrous, with hulking trolls and true giants. 
Slaughterfish are no longer invisible in the water, and their bites are deadly.
The beasts of the frozen north are even more dangerous, exercise caution when travelling near the Sea of Ghosts.
In the harsh and ashy realm of Solsteim is where you'll find the most horrifying of creatures. The predators lurking beneath the ash make short work of any travelers foolish enough to brave the dust storms.                                                    

Animals, creatures, and automatons have been scaled, have had increases in their health and damage(Anywhere from 1.5x to 3x depending on the creature) and various creatures have been morphed to look more intimidating. Changes are not lore breaking and never ridiculous. Scaling is reasonable and causes little to no pathing issues for most creatures. No creature is unbeatable, but many areas should be avoided at low levels.          
Creatures that live in the coldest regions of Skyrim are much more powerful than their more temperate cousins. And the creatures from the DLC are comparatively more deadly.(Dragonborn in particular)