Ok, thank you.
If this was placed to drain a haematoma, we usually advise it is removed after 7-10 days if no longer draining.
Leaving it in can pose a risk as an infection can occur.
I cannot see from the photo but there is usually a suture or two holding it in place which need to be removed.
I usually advise my clients come in so I can
1) Ensure the haematoma has fully resolved
2) Check that any ear infection is no longer present by taking a swab
3) Safely remove the tube while the pet is being restrained by a nurse
So, normally this is removed in a vet clinic.
If not possible and you feel confident to do so, you can remove the tube at home. Do confirm with your vet that this is ok.
Use sterile gloves and ensure your pet is being held confidently by someone.
Remove any sutures and then pull the drain through swiftly, holding on to the bit that is outside the skin.
Saline can clean the hole that is left behind, which should heal quickly.