I envy you your Cavalier, I am sure he will soon be well trained. I had two at one time, black and tan, and DD2 had a ruby. Is yours a Blenheim (brown and white)? We did our research before having our first when the children were young. They are found to be one of the most suitable breeds and have a gentle nature. They always pulled on the lead though. I had a coupling chain to attach them to one lead, and they used to bang their heads together like the 'clacker' toy -do you remember them, with two balls on joined strings!
You will make lots of new friends when out walking, dogs make a good conversation opener.