I'd second Hibiscrub for cleaning then moisturise and massage the scar tissue with a dog safe cream. When my daughter had an operation on her foot last year the doctor told her to massage regularly and more firmly than she might want to in order to break down the scar tissue. Apparently this is an important step which is often missed by patients after painful operations. It sounds as if your pup would also benefit!
My understanding is that it's the
action more than the cream that matters for breaking down scar tissue - but I'd use
Ultrasalve Ointment if it were me as I keep this stuff in my dog first aid kit and cannot recommend it highly enough. It's my dog equivalent of Savlon
HTH