Ask the old* girl.
The last three summers she has been struggling to keep up her feed, when the grass turned dry and hard.
That's when she starts knocking on the gate in the morning.Once inside the front yard, she enjoys her bowl full of lupins.Then starts seriously munching on the Kikuyu grass.
This is the only time we are glad we have a patch of that grass in our front yard. It thrives in summer - without water, in the extreme heat. It's luscious green. Great food for a toothless old girl. She is fine from autumn onwards - after the first good rains - when the grass is green and tender again.
* I did want to mention that she's hitting approx. 11 years, but then realised she might not want her age to be revealed. So I won't. :)