Homid
The homid form is the standard human form for all garou. Apart from The Curse, it is relatively difficult to tell a garou in homid form apart from that of a normal human without supernatural assistance. Garou who are born as wolves tend to be a bit more animalistic in this form, ranging from physical features (more hair, lithe build) to behavioural patterns (attentiveness, sniffing the air, "wolflike" behaviour).
Glabro
In glabro form, a werewolf gains height and weight as compared to homid form, as well as added strength. Werewolves in this form tend to take on some characteristics that of old werewolf horror movies; additional hair, sharp nails, sharp teeth, etc. Most people can realize that a werewolf in this form is not a normal human. However in some uncommon cases, a garou is able to take this form and still pass for that of a bulky human.
Crinos
The crinos form is the war form of the werewolves. They gain exceedingly more mass and become incredibly strong in crinos form, which stands roughly around nine feet tall. The head becomes savagely wolflike as the rest of the body is covered in fur, the subject gains a tail, and the body adjusts to that of what could be explained as a bipedial canine (Although the crinos is just as comfortable running on four legs as much as it is on two). The claws and teeth of a crinos become weapons of destruction, able to cause massive damage easily to most anything that can be torn into.
The crinos form also instigates the delirium into humans, causing most to flee in terror from the werewolf.
Hispo
A werewolf in hispo form resembles that of a dire wolf. It appears to be a large, prehistoric-looking beast with great power. The hispo form is quadrapedial, however the claws are capable of massive damage similar to that of the crinos form. The hispo's jaws are stronger than the crinos form's, however, ravaging an opponent with even more damage.
Lupus
The lupus form is the standard wolf form for the garou. as said before, it is difficult to tell the garou apart from that of a normal wolf without some sort of supernatural aid. Regular wolves can usually tell that something is amiss about the werewolf, though. As a result they will often attempt to avoid the garou, but in some cases a pack will accept one into their family (in most cases only if it is born into a wolf pack)