Treat it the same as any reactivity, there is plenty of information out there pertaining to training a reactive dog. I like a group on facebook called Balancing Reactivity.
Behaviors directed at specific breeds is absolutely a thing and fairly common. I see it all the time at my kennel jobs, we have had many dogs who had to be kept away from certain breeds. For example, many english Bulldogs often dont like other Bulldogs. More commonly we see breed preferences, we have had a GSD who insisted on being friends with every single Frenchie who came in. My APBT loves any and all Huskies despite being DA.
Behaviors directed at specific breeds is absolutely a thing and fairly common. I see it all the time at my kennel jobs, we have had many dogs who had to be kept away from certain breeds. For example, many english Bulldogs often dont like other Bulldogs. More commonly we see breed preferences, we have had a GSD who insisted on being friends with every single Frenchie who came in. My APBT loves any and all Huskies despite being DA.