Dependency Property Causing System.Windows.Markup.XamlParseException

I have created a user control as:

DogPersonControl.xaml

<UserControl x:Class="CareerChanges.Views.UserControls.DogPersonsControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:cc="clr-namespace:CareerChanges"
             xmlns:local="clr-namespace:CareerChanges.Views.UserControls"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <ListView Name="lvDogPersons"
              HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
              ItemsSource="{Binding dogPersons}"
              SelectedItem="{Binding Path=SelectedItem, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:DogPersonsControl}}}">
        <ListView.ItemContainerStyle>
            <Style TargetType="ListViewItem">
                <Setter Property="HorizontalContentAlignment" Value="Stretch" />
            </Style>
        </ListView.ItemContainerStyle>
        <ListView.Resources>
            <Style TargetType="{x:Type CheckBox}" BasedOn="{StaticResource {x:Type CheckBox}}">
                <Setter Property="HorizontalAlignment" Value="Center" />
                <Setter Property="HorizontalContentAlignment" Value="Center" />
                <Setter Property="IsEnabled" Value="True" />
                <Setter Property="Margin" Value="4" />
                <Setter Property="VerticalAlignment" Value="Center" />
                <Setter Property="VerticalContentAlignment" Value="Center" />

            </Style>
        </ListView.Resources>
        <ListView.View>
            <GridView>
                <GridViewColumn Header="Name" Width="100">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock>
                                <TextBlock.Text>
                                    <MultiBinding Converter="{StaticResource DogPersonNameConverter}">
                                        <Binding Path="Dog.DogName"/>
                                        <Binding Path="Person.Surname"/>
                                        <Binding Path="Person.Given"/>
                                        <Binding Path="ShowPerson" RelativeSource="{RelativeSource AncestorType=UserControl}"/>
                                    </MultiBinding>
                                </TextBlock.Text>
                            </TextBlock>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
                <GridViewColumn Header="Relationship" Width="100">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox x:Name="cbDogPersonTypeList"
                                    ItemsSource="{DynamicResource DogPersonTypes}"
                                    SelectedValue="{Binding DogPersonTypeID, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
                                    SelectedValuePath="DogPersonTypeID"
                                    DisplayMemberPath="DogPersonType"
                                    HorizontalContentAlignment="Stretch"
                                          Width="80"
                                    HorizontalAlignment="Left"  VerticalAlignment="Stretch"/>

                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
                <GridViewColumn Header="Share Phone">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <Grid HorizontalAlignment="Stretch" >
                                <CheckBox IsChecked="{Binding Path=SharePhone}"/>
                            </Grid>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
                <GridViewColumn Header="Share Email">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <CheckBox IsChecked="{Binding Path=ShareEmail}"/>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
                <GridViewColumn Header="CC Notified">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <CheckBox IsChecked="{Binding Path=CCNotified}"/>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
                <GridViewColumn Header="Adoption Declined">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <CheckBox IsChecked="{Binding Path=AdoptionDeclined}"/>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
            </GridView>
        </ListView.View>
    </ListView>
</UserControl>

DogPersonControl.xaml.cs

using System.Windows;
using System.Windows.Controls;

namespace CareerChanges.Views.UserControls
{
    /// <summary>
    /// Interaction logic for DogPersonsControl.xaml
    /// </summary>
    public partial class DogPersonsControl : UserControl
    {
        public DogPersonsControl()
        {
            InitializeComponent();
        }

        public object SelectedItem
        {
            get { return GetValue(SelectedProperty); }
            set { SetValue(SelectedProperty, value); }
        }

        public static readonly DependencyProperty SelectedProperty =
           DependencyProperty.Register(
               "SelectedItem",
               typeof(object),
               typeof(DogPersonsControl),
               new FrameworkPropertyMetadata(
                   null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
        public bool ShowPerson
        {
            get { return (bool)GetValue(ShowPersonProperty); }
            set { SetValue(ShowPersonProperty, value); }
        }

        public static readonly DependencyProperty ShowPersonProperty =
           DependencyProperty.Register(
               "ShowPerson",
               typeof(bool),
               typeof(DogPersonsControl),
               new FrameworkPropertyMetadata(
                   null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
    }
}

The converter is:

    public class DogPersonNameConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            if (values[3] == System.Windows.DependencyProperty.UnsetValue)
                return "";

            bool ShowPerson = (bool)values[3];

            if (ShowPerson)
            {
                string surname = (string)values[1];
                string given = (string)values[2];

                return string.Format("{0}, {1}", surname, given);
            }
            else
            {
                string dogName = (string)values[0];
                return dogName;
            }
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

The views that use it, do so as follows:

        <uc:DogPersonsControl x:Name="lv" ShowPerson="True"/>

When i invoke those views, I get:

System.Windows.Markup.XamlParseException HResult=0x80131501
Message='The invocation of the constructor on type 'CareerChanges.Views.UserControls.DogPersonsControl' that matches the specified binding constraints threw an exception.' Line number '44' and line position '10'. Source=PresentationFramework StackTrace:
at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri) at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri) at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream) at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator) at CareerChanges.Views.TestWindow.InitializeComponent() in C:\Users\Tom\source\repos\CareerChanges\CareerChanges\Views\TestWindow.xaml:line 1

This exception was originally thrown at this call stack: [External Code] CareerChanges.Views.UserControls.DogPersonsControl.DogPersonsControl() in DogPersonsControl.xaml.cs

Inner Exception 1: TypeInitializationException: The type initializer for 'CareerChanges.Views.UserControls.DogPersonsControl' threw an exception.

Inner Exception 2: ArgumentException: Default value type does not match type of property 'ShowPerson'.

In those cases, it failed on InitializeComponent() of the view;

I'm at a complete loss as to what the problem is.