I never collect, I leave envelopes. I hardly ever get the 'leave it till next month' line because I'm normally half way round the house before they even realise I'm there!! I'm not afraid of dogs, so don't get that problem, and if the gates locked, I hop over it!!!
Just get on with it, and stop creating problems for yourself!!!
spot on
just do it
let em come out and cancel you after half the house is done
and if they try.....drop em
keep ya leaflets going out
put some posters up(local shops,hairdressers,laundrettes,garages and doctors notice boards are all good)
replace all dropped customers with new better priced ones
as for dogs,put it on your t+c that they are kept in
if not .....drop em