Hi, 

Try this code:

1. Add Fields to the Model:

from odoo import models, fields

class AccountMove(models.Model):
    _inherit = 'account.move'

    animal_name = fields.Char(string='Animal Name')
    service_date = fields.Date(string='Service Date')

2. Update the View:

<record id="view_invoice_form_inherit" model="ir.ui.view">
<field name="name">account.move.form.inherit</field>
<field name="model">account.move</field>
    <field name="inherit_id" ref="account.view_move_form"/>
    <field name="arch" type="xml">
        <data>
<xpath expr="//field[@name='partner_id']" position="after">
                <field name="animal_name"/>
                <field name="service_date"/>
            </xpath>
        </data>
    </field>
</record>

Make sure to adapt the code based on your specific model names and view structures.

Hope it helps