Why not get a photo of your dog riding it. That would attract attention and encourage people to buy it.
Buy my bike, it’s so easy to ride, even a dog can ride it.
I would suggest an Irish wolfhound or one of those deerhounds, a chicwawawawawawa would look silly.
Option 2 would be to get a local sexy chav to sit on it, short shorts, Elesse trainers and some gold bling would do.
Buy my bike, get a chav with it.
Nobody is going to steal a bike from a fellow chav, so it will always be safe.