Our expert says:
Yes I think this is a case of jealousy and you might find that the Bully has now made this connection that your x breed is actually getting more attention while playing fetch. It’s important to praise good behavior and try and have some sort of a negative experience when the Bully is showing “bad “behavior. A water pistol (maybe with a bit of citronella oil) is a useful safe tool to inflict a negative experience. I would also try and take them for walks without playing fetch for a few times and see how this goes and then praise the hopefully good behavior, after this start playing again and use your water pistol should it be necessary. It is very important not to make a huge fuss when the Bully is showing aggression especially in front of the other dog as this will encourage bad behavior.
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