Hi All I have a ten month old female whippet who, since shortly before her first season at eight months old, started marking on walks. Even after her season ended this behaviour continued. She frequently marks on walks (sometimes performing acrobatics to reach certain areas). This, in itself, does not bother me but, on three occasions over past two months, she has marked in doors. This happened twice in my mum's house - she has a male (neutered) dog who my bitch loves to sniff. The other time was in my house and was in the exact spot where, ten minutes earlier, she was eating her very first pig's ear. I'm fairly certain this is territorial - perhaps connected to strong or unusual odours? I'm fairly certain it's not a toilet training issue. She has been house broken for a long time, always goes to door etc - plus when she's marking, it's only a very small amount. I'm fairly certain it's not anxiety - she's a very easy going dog: loves people, is around other dogs at daycare a lot (LOVES other dogs), travels well, isn't alone too often but seems fine on odd occasions when she is, is never phased by loud noises, new settings etc. (Obviously I don't know what goes on in her head but her behaviour never suggests anxiety). She is due to be spayed next month so I'm hopeful this will help with the marking. As I say, it's only been three times in a few months so it's not a major issue, but would be interested to hear people's views.