The cats in my neighborhood are terrible hunters. The squirrels and birds don't seem deterred by them much.
However, they do pee and poo in my garden. In the summer, I can smell their spray as soon as I open the front door. And I can smell their poo when I go in the beds to weed.
I would pay good money for a cat deterrent that really works. I'll give up 1 or 2 weeks pay. Totally serious!
The squirrels and birds don't seem deterred by them much. 
And I can smell their poo when I go in the beds to weed. 
