Yes, most boxers seem to twitch a lot in their sleep. We have 4 puppies right now that are only a week old, and last night my husband and i watched as all 4 of them and their momma were all twitching in there sleep. If your pup's twitching seems violent or goes on for an extended period of time, it wouldn't hurt to call the vet just to make sure the pup isn't having seizures. But as long as it seems to be sleeping, I think it's just fine.