Of course you realize, this means War

While outside with Mike and Thor just now, we discovered something under the deck. The neighbor cats have turned it into their bathroom.

I knew there was a spot on my lawn where they kept digging and shitting, but under the deck there are literal mountains of cat shit.

I understand why Buddy gets so agitated when they’re outside now. Now I begin research on my counterattack.

Anyone got suggestions for detering cats?