Seen on a walk in my neighborhood this week, and apropos of nothing,

[Ocelot II]

but I'd sure like to know more.

[Irish_Dem]

1. Literally it means strange dog, but probably means unpredictable dog.

Unless you live in the US and someone thinks it sounds cute.

[Ocelot II]

2. I live in Minnesota, not France, so it's probably somebody with a quirky sense of humor

and a weird dog.

[Irish_Dem]

3. Yes they could also be French Canadian? Or picked it up on a trip tp Quebec?

Right, someone thought it sounded quirky and they have a dog.

ETA There is a lot of chain link in that fence, so at least take care when you walk by.

[Warpy]

5. It also wouldn't be understood by the garden variety burglar

which is why it might be in French.

[Irish_Dem]

7. Correct. Not a strong warning to non French speaking robbers.

But perhaps most English speakers will take pause like the Ocelot did.
Americans will understand the "ATTENTION" part and the "BIZARRE" part.
Probably "CHIEN."

Some parts of northern states have French Canadian descendants so hard to tell.
Minnesota is west of Quebec, so maybe not.

Most likely a souvenir from a trip to a French speaking country.

[Diamond_Dog]

4. Wow, that *does* arouse one's curiosity...

[Hermit-The-Prog]

6. I prefer "Trespassers will be composted".

I have a backhoe to make it so.

[Irish_Dem]

8. When you have a backhoe you can do just about anything.