What do Ты think happened to Bolt's mom?

I Think she died

I think that she had Щенки and then they sent the Щенки out to different places, или the Щенки in the same pet store could be bolt's bro's and sis's but just doesn't look like him. It is srtange that all of the Щенки look the same exepet for bolt, is it sapost to be the same breed? Bolt just could be white I guess but I think that only American shepards are white, mabey they are brown, I don't know, in the book and in the movie, they never told. None of the bolt facts tell either, so ask disney.