He’s a dog and he is a sweetie except for when he is being taken for a walk, when he is a pain in the arse because Bob hates other dogs and just wants to bark at them / chase them / bite them. The other thing that Bob really likes to bark at are trains, and by a happy coincidence there is a railway line that passes the end of his garden, so he can run about and woof at them every twenty minutes. Which is just as well because his owners don’t want to walk him so much, like I say, he’s a PITA.