As you know, the Chicago Park District recommends that you use a 50 pound link chain to control your dog as it enjoys sniffing at the flowers in the park:
The Chicago Park District also recommends a 50 pound link chain be used at the local off-leash dog park (or Dog ‘Friendly’ Area):
(We doubt that most experts agree with this last recommendation!)
We’ve been wondering where the bureaucrats at the CPD came up with this idea, but thanks to the Internets we think we’ve found it!
Our guess is that during their travels our sign makers encountered this fellow –
What a splendid way to curb your hyena!
Perhaps this revision of the sign would be a more honest depiction of what the CPD thinks of us.
South Poop 
I’ve always liked the graphics on these signs . . . obviously dating back to the 1950’s – 1960’s.