My girl she just went into heat, for the second time, her nipples have swelled a little, but my boy, he's pissing in the house now. Why? He's been house trained for a long while. I had them since 3 1/2 weeks. Could she be prego, is that's y he's pissing? We also leave them home together by themselves throughout the day.
I don't think its because she could be pregnant. It may be because he is just marking his territory as male dogs will do. Unneutered males even more so. I would say to get them fixed. Pitties are the best dogs, but we really don't need anymore on this planet lol.
She is in heat and he's a boy, of course he is freaking out. And what are you doing leaving them together? You have a good chance of ending up with a too young female pregnant to what I am guessing is her brother! Why are they not neutered?