Poo picking ,Harrowing , resting and. , aerating, with the resting bit last : )
I spend a bit of time around stables and liveries , and see the poor grass roots starved of oxygen. Grass will recover a lot quicker after a good spiking. ,
An adult terrier very hard work : ) one way would be to get a kitten in the house let the dog know it's part of the family . And gradual supervised contact , may work , but it may be to late . Best time for breaking terriers to other animals is as a pup .