Do all entities of the conceptual model need to be related?

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I was developing a conceptual model for a database according to the requirements of the activity, but I came to doubt the title because my model ended up being according to the image:

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modeling

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I believe that it is not necessary for all entities to be related, imagine a veterinary system where the user of the system registers the data of the PET and the owner of the PET, in this case the entity PETx has to be related to CLIENTE who would be the owner of PET, but the USERS, corresponding to users who use the system does not need is related to any of the other entities, unless in the Business Model, it is necessary to know who served the CLIENT 'x', for example.

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    Not all entities need to be related yet relationships are the wealth of their data model. Question why there is an entity without relationships in its model.

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