Plantuml class diagram with multiple children: Any way to bifurcate the arrow?

Question

My attempt:

Animal <|-- Cat
Animal <|-- Dog

Result:

  ┌────────┐
  │ Animal │
  └────────┘
   Δ      Δ
   │      │
┌──┴──┐┌──┴──┐
│ Cat ││ Dog │
└─────┘└─────┘

That is not how a class diagram is supposed to look like.

This is:

  ┌────────┐
  │ Animal │
  └────────┘
      Δ
   ┌──┴───┐
┌──┴──┐┌──┴──┐
│ Cat ││ Dog │
└─────┘└─────┘

---

As suggested, I asked if this is possible on the PlantUML forum.

Answer 1

You can do something like this:

@startuml
class Animal
together {
  class Dog
  class Cat
}
Animal <|-- Cat
Dog -- (Animal, Cat)
@enduml

Answer 2

There's skinparam groupInheritance 2 which will serve your purpose, although it doesn't work with skinparam linetype ortho as one might expect. Alas, GraphViz is the rendering engine, so that has limitations.

@startuml
skinparam style strictuml
hide empty members
skinparam groupInheritance 2
class Animal
class Cat extends Animal
class Dog extends Animal
@enduml

Answer 3

An interesting thing to do in plantUML but "this is not how class diagram is supposed to look like" is not correct (to my knowledge, at least).

The notation is clear for inheritance/generalization but whether you join the lines before the arrow or have separate lines with separate arrows is a matter of visual preference/making it easier to understand:

• Try to sketch the image on top of that wiki you linked with distinct arrow from each child to it's parent, it will be much more messy
• Scroll down a bit on wiki to https://en.wikipedia.org/wiki/Class_diagram#Generalization/Inheritance