Doggy problems~~

Just now a friend of my mom came here to deliver some stuff I'm going to take to Monterrey tomorrow morning and my twin dog 'Cirilo aka Pompis' tried to bite her O_O I'm in shock, he has always been a nice dog, even with stranngers, he'd always barked to other people that's not from my home, but never bite them ._. and now he bites people, he bite a person that is familiar with us and the dog bite him on the leg! maybe is the age, but I don't think so, he's still young. Only 3-4 years old.

Maybe we should take him to the doctor, because I don't think that's normal... not on him...