It's really off putting! I hate walking viewing a house with a strange dog sniffing my ankles. Or jumping up at toddler DD, who gets scared and then has to be carried. Or yapping and snarling from the kitchen because I've asked the owner to shut it away.
Viewed one recently where the owner hadn't even bothered to pick up a dog poo in the garden. Toddler DD stepped in it
We didn't notice until she left a trail of dog poo indoors. Owner tutted because of the floor, but I was so angry at the thought of having to clean dog poo off her shoes, having the smell in the car, disinfect them at home etc I just thought 'serve you right'. Why on earth would you not pick up after your dog when you're trying to sell your house??
Then there are the owners who say 'I'll just keep him in the living room' and sit holding the straining/growling/whimpering dog by its collar, so you have to rush that bit of the viewing.
We saw one house where the dog was in the garden, barking and growling. Owner said 'he's all right with people but he might jump up. Do you want to go in?' We declined and ruled out that house.
Why don't people take the dog out for a walk or get a friend/relative/neighbour to look after it for the half an hour it takes to view? We always book a time days in advance so it's not like it's short notice.