Anylite? So the dog definitely wasn't an animal, wasn't an andalite, and wasn't a Yeerk. He had to have meant "Andalite." A dog wouldn't have known anything about andalites even if they could talk, an andalite would've known whether or not there were others on the planet most-likely, and the Yeerks would not mispronounce the name he thought, plus they didn't have the ability to change. Everything pointed to something else going on here...the human with the leash had to know the dog was a changeling...so the dog was probably a human, a human with the same powers that he and Sam and Alec had gotten that night.
Then Jas figured it out, he was surprised there wasn't a bright flash over his head, the scanner...maybe it could detect other morphers. They had found that blue cube, that Escafil on Earth...there had to have been an andalite before Jethsa, and perhaps that Andalite had had the same idea as Jethsa, giving morphing powers to other humans to fight the Yeerks. It was a long shot, but it was the only thing that made sense. <Sam, the dog...I think he's a changed human. And the other ones probably know about it too. Think, that blue box was already here...there must've been another andalite, maybe that andalite gave the morphing powers to these kids too...had the same idea. The scanner...it might've been detecting these guys, detecting other changelings. Look, I talked back to the dog...so they know about me...I should change back. I think we should talk to them...there's no going back. Are you with me Sammy?>