The horse is smaller than the cat and the chicken

[ba-colin]

Describe the bug
In the pet coding window, the horse is smaller than the chicken and cat.

Screenshots

Additional context
Add any other context about the problem here.

[tonybaloney]

This animation was based on the neighbourhood chicken that stands a mighty 10ft tall.

In seriousness. The bounds for all pets are the same. Some of the images have more space at the top (like the horse) so that they can stay a relative size during some animations. I would guess this is for the animation where it goes on it's hind legs.

We could add some sort of relative sizing for animals. this would be a change to the pet class in typescript. PRs are welcome