why would a male dog all of a sudden start marking his territory in the house?

I have four dogs, a female boston terrier, female boxer, male min pin and I just recently, about three months ago, adopted another male min pin. he is around a year old i was told and he is almost blind. all of a sudden about two weeks ago, he started marking in my house..... on shoes, furniture, this morning it was my daughter's back pack !!! what can I do or what causes this?

Asked by Member 1170006 on May 13th 2013 in Behavior & Training
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