How to get my sometimes aggressive Doxie to not try and bite my boyfriend?

I have had my senior Doxie rescue for a few years and recently started dating my boyfriend. Most time they get along great but lately my Doxie has been aggressive and growling at him trying to bite his ankle when he approaches me or comes home or tries to get in the bed. Other times they are cuddling together just fine! I am trying to promote peace between them. Any ideas?

Asked by Member 1071080 on Nov 16th 2011 Tagged senior, rescue, biting, aggression in Aggression