..and a little story to tell
Many years ago I was adopting a cat from the Sarasota, FL Humane Society. They wanted landlord approval and a referral from someone to say how I would be with animals - I had never had to go thru so much for cat adoption but it was worth it and I knew I was a good mom
In their waiting room they had two bulletin boards:
One was of cats and dogs and their happy owners and other little cuties up for adoption.
The second showed maimed, sick and abused animals. The one photo that to this day (22 years later) still sticks in my mind is one of a horse, lying on its side all ribs showing, absolutely on death's door and it was still alive. The caption on that board simply said "This Is Why Our Rules Are So Strict" the photos and that sentence said a lot – I, for one, was grateful for their rules!
So, what if, at shows you had a board with some cham pictures, such as Dystocia, MBD, URI's etc. This would not be meant as a shocker but for people to understand the importance of what you are telling them. It could certainly be done in a tasteful and educational way (do ya hear the teacher in me??? lol!)
When I do my presentations on the wild silk moths I always bring Toby, who is a crippled sphinx moth (not a wild silk but still impressive) that I hand fed for several days before sending him to the fridge, then freezer. He was crippled because the stick for him to climb on had gotten dislodged and he was unable to climb and inflate and dry his wings. I use his story to impress upon both the kids and parents the importance of the stick! And believe me - it makes an impression!
So my point is that actually seeing deformities and disease first hand (or photos) can have a much greater impact then talk or a book can. Anyway, just an idea.
Btw, that cat I adopted? She died at home in my arms 17 1/2 years later. And here’s Toby - these are old scanned in photos so they are not too good

Toby feeding

lele

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0.1 veiled - Luna
0.2 house geckos - Gaia & Tia (both MIA 
0.2 felines - Kyndra and Líta
1.0 African Clawed Frog (for summer)
0.5 Mad. Hissers (for summer - all girls, no little ones, whew!)