I had never thought of that issue, but now that you explain it like this, I see your point.
My thought on that is maybe "some" querents might get put off, but this will be a small minority.
Most people who come for professional readings do know at least a little bit about tarot... and I expect they will also be openminded.
I know a very succesful professional reader whose deck of choice is the Wild Unknown wich is a great animal deck, and apparently nobody ever batted an eye, so I suppose that would apply to your clients also.
As has been said earlier, the real point is which deck will make you sparkle as a reader, will ignit your intuition... then your querents will be satisfied, no matter what.
Myself, I have had readings with many different decks and it has never mattered to me, so long as it enables the reader to start seeing things..... the only time I have been (slightly) disapointed is when a reader used their RWS, because I felt it is not the most exotic of decks.... but that is just me.
When I offer readings I like to offer a selection of decks. Not my whole collection (that would consume too much time) but a selection of five or six decks. I name whatever few decks from my stach I am attracted to at the moment, and the querent choses. It's part of the reading, which deck they choose, because such card will have a more "sensual" or more "eemotional" etc... side if taken from deck A rather that deck B.
Maybe you could offer a selection with several animal decks and one traditional deck, and see which one is getting chosen the most ?