I have a yellow lab i found, no idea of her age, but she went through heat, nipples popped out and didnt go away, so I figure that was her first heat.
Only reason im wondering, is i've been debating when her birthday should be and how old she is.. I've had her about 8 months, 4-5 months ago she went into heat. Any ideas? (I got her fixed, YAY, i never had a female dog till her, and having blood on the carpet and kitchen floor and bathroom floor and a swelled vagina was not my idea of a pup