I have a 2 years old male 史納莎. Now I just take a 2 months old male 洛威娜 to home. My old dog (史納莎) always piss on the floor when he meet the new 洛威娜. How can I solve this problem? (My 史納莎 never pissed on the floor since his 4 months old) I have cleaned the floor for above 10 times since yesterday...
Thanks.