My boys are big at 64 and 63 lbs and I'm trying to get them each to around 58 poounds.
So what I did was, took a couple of bananas, mushed them up, added water (filtered of course..lol), stirred and spooned the mixture into ice cube trays and froze it.
They're just banana flavored ice cubes but they go crazy for them.
When we come back in from walks, instead of giving them each an ice cube (which they break and swallow right away), I let them each lick their own tray. It's a great way to cool them down.
Happiness is looking at your dogs face...and forgetting all your problems