Write a polite e-mail from my cat to the neighbor's cat, asking it to please stay out of his special area of the lawn.
Dear Mittens,

How are you? It's been a lovely summer so far, and I can see that you are enjoying the great outdoors like I am. Our backyard has some lovely sunny spots to warm up in. You are most welcome to visit whenever you like. However, may I make one request? The southwest corner of the lawn beyond the oak tree is my special warming spot. I regularly use it and would be grateful if you could instead use another area if you visit, like the concrete slab immediately west.

Gratefully,
Grumpers