Why is my young female dog suddenly attacking my older, fearful dog?

Question

My youngest bitch is a Jack Russel/Shiz Tzu and has always been territorial, hyper and slightly *bitchy* as I know Jack's can be. However recently she has started arguing and fighting (quite aggressively) with my oldest bitch (11yrs) . She does not argue with my other dog hardly ever but she always tries to get at the other bitch to the point where she is shaking uncontrollably and crying. I am very worried about her. Or is it something with the other bitch i should be worried about? Pet's info: Dog | Mixed Breed | Female | unspayed

Dr. Massimo Orioles, DVM, Cert AVP, MRCVS · Accepted Answer

It is probably a territorial/hormonal problem which could be resolved eventually by spaying her. Try to observe them and see when that happen and try to avoid the situation ( for example over food = feed them separately and so on).

Why is my young female dog suddenly attacking my older, fearful dog?

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