His name is Mozart and he's a Speagle (Cocker Spaniel X Beagle) Currently 5 months old and a very good boy.
This is him celebrating Howl'oween for the first time.
Sew or glue velcro to the back. Use hooked velcro on the harness and loops on the felt.
The felt will stick to the hook velcro on the harness but not be very lasting, dogs can be pretty harsh on their costumes, I like the added security of velcro on the felt.