We have an 11 year old springer who has attacked my daughter and me. This happens out of the blue. Do you think we should pull her teeth to deal with this?

I am the owner of an 11-year old female Springer spaniel who we have had since she was 6 weeks. Approximately 2 years ago we bought another Springer male. Although the older Spaniel has always nipped, she has now become more aggressive. My daughter who is 24 was just hospitalized for an infected bite and I myself was out of work last year for a week from a bite from the older Spaniel. There have been several other bites in the last few years. We have been to a doggy psychiatrist and have learned on how to deal with some issues, but sometimes it just happens too fast. Do you think pulling her teeth or removing the canine's is more humane than euthanasia?

Thank you.
Lorraine