Fill a kiddie pool with water and it will look like a Disney nature scene all the critters that will come to drink.
Fill that kidie pool with old antifreeze and the cougar problem is solved because drinking antifreeze causes cougar to behave like frogs - they croak!
;-0
However, is not legal to fill a pool with anti-freeze. Leaving the drain basin out, however . . . .
Sounds like fun but I don’t want anything picking on my Boston Terriers. They’re wimps.