Ferdinand:

He is jealous of Valiente. He is worried you may decide you want a real bull instead of a flower loving bull.

Bones:

No one. He knows you only love him but he would be willing to fight for you in an instant.

Quapo:

He is jealous of Bones. He knows that you and Bones became close after you arrived at Casa Del Toro and thinks he'll try to take you away from him.

Valiente:

He is jealous of Quapo. He knows Quapo can be a flirt and worries that you may want Quapo instead.

Angus:

No one. He trusts you completely.