Vincent being vaccinated

At the veterinarian house.
The vet is giving a shot.

Grandma is trying very hard to give comfort words to Vincent :)

A Harness

Selby bought a harness for Vincent because she would like to walk around with him in the neighborhood. It's totally new for Vincent. He isn't use to a harness or leash, thus he tries to bite the harness off and doesn't want to move at all, acting like a statue.

Can anyone suggest how to teach Vincent to walk with a harness?