Panel 1: Now that we're at what I hope is the local hospital, a man I firmly believe to be a doctor (perhaps their pediatrician, Dr Plett) tells Elly "It's just a small fracture, Mrs Patterson; we'll have to immobilize the area." (They should have done that a while back but this is Foobland so.....) It should be noted that, for some reason, it looks as if he's got his stethoscope next to Lawrence's carotid artery; if so, that (or the fact that the man's fingers are eleven inches long) could be what's got him freaked.
Panel 2: Oh, wait; his panic is due both to his injury and the crappy way he's been treated so far. He as much as says so when he says "You mean I gotta have a cast and crutches??" as if it's a death sentence. Doctor Plett smiles and says "Looks that way!"
Panel 3: Lawrence's anxiety and Doctor Plett's joviality give way to confusion when Mike frowns and says "Boy, Lawrence, you lucky dog" in the most sullen tone he can register.
Summary: This should be a warning sign that Mike gets jealous and envious fairly easily and doesn't as such care what he's in envy of. Then again, he also wants to be a mewling, puking one year old again so he can get more attention so we know that he's got a screw or fifty loose.