In the aether.

 Any resemblance to a real comic strip creator is accidental.

Her humors are out of balance.

Human sacrifice.

 And we all know what happens to lab rats.

They get their own animated cartoon.

The golden opportunity.

 A captive audience is the best cure for a headache.

So much better than a Get Well card.

His master's voice.

 The little nipper is used to rolling over.

Don't play dead, whatever you do.

The green-eyed monster.

 He'll sue for alienation of affection !

Better her than him.

Me and my baby.

 Baby needs a new set of tires.

There are some forms to fill out.

In the event of accident.

 The other parts are up for grabs.

Being of sound mind and body...allegedly.