Exercises to build back leg muscles

Hello, my dog has had 3 operations on his back legs and I now need to build the muscles in his back legs up again. Does anyone have any ideas? I've got him into swimming but I really think he needs to be doing more strength work.

what was the operation for?

I wouldn't over do it too much, keep him swimming till the leg is stronger them get him playing with boomer ball and hilly walks etc.

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Cruciate ligaments, both back legs. He's had hydrotherapy and I've been taking him to the river and sea to get extra swimming in. We are doing hill walks too.

What's a boomer ball?

A boomer ball is a huge solid ball which is indistructable, they love them!

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