My 3 month old ruby puppy (Keira) constantly wants to play fight with my 1 year old blenheim dog (Sophie). Sophie is a timid dog and let's Keira get away with alot. Sophie will yelp if Keira hurts her, but she isn't assertive enough for Keira to stop. Up until Keira came along Sophie had a nice quiet life, but I wanted a second dog to keep her company. Should I let this behaviour continue or should I intervene? I can see that Keira will be the dominant dog, but it seems unfair to Sophie that Keira's constantly in her face.
Any advice is appreciated.