Can anyone help with identifying this engraving please?

Not sure if this post would be better suited to poetry/Shakespeare's Sonnets, but as it is regarding an engraved work of art, I thought this might be a better place.

I have uploaded the item in question. It's from the top of the title page of "Shakespeare's Sonnets" and shows two grotesque animals: my question is this: what are they meant to be? Lions? dolphins? dogs?

Any suggestions would be greatly appreciated.

Thanks for looking.

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Can anyone help with identifying this engraving please?