Female dogs can come in to heat after 4 months of delivery of puppies. Dogs can have 2 heat cycle in a year which are usually 6 months apart. If they become pregnant then their heat cycle is not disturbed and occurs on schedule time. So, gap between 2 heat cycle in dogs is 6 months regardless of pregnancy.
My bitch gave birth on the 1/12/10 and my dog has been sniffing around and trying to jump on her is it a possibility she is coming on heat or am I worrying un necessarily?