Our aging Border Collie really enjoys swimming. But his rear-end is getting weak, with muscle atrophy in the rear legs. So his rear-end is sinking as he cannot kick-stroke efficiently with the back feet.
He has a flotation device, but the floating foam is (a) above his back (not really in the water), and (b) only on the chest rather than the rear-end where he needs a lift.
Is there any kind of flotation device for the back-half of the dog, to lift the rear-end without impairing swimming?