I am guessing that it is at least part Great Dane! I am not good at guessing, although I'm getting better. I have a book that shows good pics of all kinds of breeds and this dog looks like the Great Dane! If there has to be something else in there--maybe boxer or lab? In case it is part Great Dane---couple things to be aware of: Prone to hip dysplasia and some genetic heart problems--because they are very large and heavy. (Male can weigh up to 160#----Female-up to 130#) They are also prone to bloat, which is a life-threatening emergency and you might check out bloat/dogs on the internet--I posted a very good bit of info on either this forum or another one I'm in. If not here try:
Pet information - dog information - cat information - Canada's pet information center for dogs cats and humans And I go by Corky/Max in both these forums. Even if not a Great Dane---All large dogs are prone to bloat and it is something you need to know about--know the symptoms and how to react because it is a life-threatening situation and one that you have to act fast on and get to the vet immediately or it will die if not attended to quickly!!
There are things to try to prevent hip dysplasia from happening--one that I know of----give a lot of Vitamin C, although this is better if started as soon as possible. I have posted about vitamin c before too--here or/and other forum. You have to use the kind that doesn't upset the stomach---I just can't go into detail on this--but vit. C is good for a lot of things--and don't let a reg. vet tell you that they don't need this, BECAUSE THEY DO!! You know--a very good book that tells about vitamin c and many other good things is: Earl Mindell's Nutrition & Health for Dogs--mine was published in 1998--but still an excellent book-----Try finding through your library or check out Amazon.com or/and Ebay----sell used books real cheap and know one of these places had it a month or so ago but not sure there were many left.?
Whatever your dog's 'make-up', it is a handsome dog----love it and take good care of it! Hope you find out for sure what kind of dog it is, lol, I am now wanting to know myself! BUT YOU WILL LOVE IT NO MATTER WHAT IT IS!!!
Came back to give this address for the Bloat info:
http://www.globalspan.net/bloat.htm#Symptoms Just click on it and you'll be there. Not sure but you might have to scroll to the top of the page. Yes-(just checked it out--When you bring this up you need to go to the top (beginning) of the article.