"Just Tosh," Owen said, offering Ianto a slight smile. "And a puppy, but I don't think the puppy will pose any danger," He said, taking a firm grip on Ianto's hand as he looked up at him. "All right?" He asked. "I promise I won't let anyone else near you if you don't want them to be."
Especially not Jack. Jack was not getting anywhere near Ianto until he was somewhat stable. And even then, it would be iffy whether Owen would let him in and allow him to potentially break Ianto again.