You can! You do regain them later too if you want something different, but I'll copypaste another if you want him to have full hyena transform powers on top of it.:

FOR ANIMAL TRANSFORMS, I'M GONNA BLANKET IT LIKE THIS. If you only change a particular part like claws or teeth, the stronger it will be. If he is a full hyena, he might be able to run quick or have some heightened senses, they won't nearly be as strong as if he just enhanced his eyes or something.

LET ME KNOW IF THIS WORKS.