I cant help you with the cat's. Those other picture's just look like drought stress. New sod doesn't have a very large root system and you are on top of sandy soil. And you are in climactic zone 10b. You have to go to southern Florida or Hawaii to be in the same temperature's. That could dry that fescue out. Let the heat back off and the rains (does it rain there?) come. Here's a map for you.