Rails: Validation error messages are not displayed

Question

I am new to rails, trying to learn by creating a simple test project where I am trying to display validation error messages on my browser. The problem is that the messages are not getting displayed. I am referring to this blog

#app/controller/dogs.rb
def create
  @dog = Dog.new(dog_params)
  if @dog.save
    redirect_to dog_path(@dog)
  else
    p @dog.errors.inspect
    render :new
  end
end

# app/models/dog.rb
class Dog < ApplicationRecord
  validates :name, presence: true
  validates :age, presence: true
end

<!-- app/views/dogs/new.html.erb -->
<h1>CREATE NEW PUP!</h1>

<%= @dog.errors.inspect %>
<% if @dog.errors.any? %>
  <% @dog.errors.full_messages.each do |message|%>
    <h3><%= message %></h3>
  <% end %>
<% end %>

<br />

<%= form_for @dog do |f| %>
  <%= f.label :NAME %>
  <%= f.text_field :name %>
  <%= f.label :AGE%>
  <%= f.text_field :age%>
  <br />
  <%= f.submit "SUBMIT" %>
<% end %>

I have 2 observations:

1. If I go to the networks DevTool in chrome and then check the preview tab, I can see that the error messages are being rendered in the preview tab. But I can't see them on the main browser/output. Tried with multiple browsers. Same result.
2. Upon printing @dog.errors.inspect from the controller to the terminal, I can see the errors. But when using @dog.errors.inspect on the view, the errors[] is empty.