depends of the breed + what work they are bred for, a lot of terriers bred for hard graft below ground dont make good pets, there is probably the occasional exception to this however.
my "pet" parson russel bitch has however turned into a good bushing terrier and only started hunting at the grand old age of 6 and a half, tbh, i didnt think she had it in her, shes 8 now and very handy when i go ferreting with the lurcher
Thats about right, my two Russels live in but they only go Rabbiting, my mate on the other hand goes digging and has got a lakeyxpat and i wouldnt let it near the bloo