nurchuring mother turns aggressive

Question
my dog is 3 years old. she just had a litter of puppies 3 weeks ago and has been a brillent mother up untill now. the past 2 days she has been very aggressive, attacking her puppies and went for 1 of my friends. i dont no what to do with her. she has changed so much in herself. i noticed blood coming from her rear end, is this normal?? could you give me any addvice as to what to do with her as she is part of th family and we dont want too lose her.

Answer
Hi Stephanie

Some females get fed up with their off-spring.   What I would recommend is taking her out and letting her in with them only to feed.  

Other than the change of attitude and blood from her rectum, have their been any other noticeable changes?

What is she getting fed?  Was oxytocin administered or has she seen a vet recently?  What prompted her to challenge your friend?