19th Century Billboard

Is your parrot as sick as a dog?
Perhaps there's a fault with your frog?
See Bushman and Spooner,
Not later, but sooner;
Their service will leave you agog.

19th Century Vets' Advertisement, Florence Street, Islington, London.

I know that frogs don't develop faults as such, but the alliteration ran away with me... The last line is a bit lame (much like the animals, I guess)