Do you know the signs to watch for that may indicate your intact female dog is going into heat? Most dogs will have some physical changes that are easy to spot. There are a few dogs, usually small breeds, that may not make it so obvious. Three signs that are easy to look for and see are: 1️⃣ Bleeding or spotting from the vulva. Probably the more obvious and what owners look for. Heat cycles in dogs can last anywhere from 2-4 weeks, but you may or may not notice bleeding the entire duration or th