Can anyone tell me what my dogs weird behavior might mean?

[Kim]

I have 2 dogs-they are brother sister from the same litter and are absolutely inseparable.

Recently the brother dog got very ill and spent 3 days in the emergency. Tonight I brought him home all better.

At first the sister dog seemed happy to see him, but while she was sitting next to him 5 minutes later, she all of a sudden snarled and what looked like attacked him aggressively.

She snarled very mean-like and chomped down on him on the side of his face. I scolded her and she stopped, otherwise I don't know what might have happened.

He wasn't hurt but it looked very viscious and she's never acted that way before. Can someone tell me what the heck this means???

 

[Julia]

she now challenging him for top dog status

 

[rodrim79]

Could be a dominance issue. It could also be that your female believes he is dying and is trying to put him out.

 

[Debbie]

If it's just a 'one off', I wouldn't worry about it too much.
But keep a careful eye on her.

You did the right thing, by scolding her.

It's possible that he smells really wierd after being at the vets and she is reacting to that.