Are short walks enough.

I'm 76 and recovering from cancer. While I shall grow stronger with regard to the latter, I live alone and I'm not going to get any younger!  My dog seems happy with two or three walks of between 20 and 40 minutes a day, and usually a few play sessions with toys around 10-30 minutes each day. He's a Nova Scotia Duck Tolling Retriever Cross and about five years old (he's a rescue, from Roumania I am told. I cannot let him run off lead as he can be a bit rough with smaller dogs and I'm nervous of this. Am a shirt-changing him?  If so, what should I try to do?

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