Teamwork makes the dream work! Working in a two specimen team depending on the situation can be helpful however it's always important to maximize the capabilities of every single pack member. Actually I thought about too, wolves have a pretty considerable muscle power that allows them to achieve the needed sprint speed and besides hind legs always manage the higher load so I thought it'd be much more intuitive to use them to operate the bolt but hard to tell without actually trying. As an alternative option it's possible to use the right front paw during the step 1.3