I also have a Mastiff/GS mix (yours looks like a dane though). He's a little more than four but is a rescue and was chained outside for his first three and a half years. He's just as sweet as can be--and smart--but getting aggressive with other dogs, especially males. He's 140 lbs so I'm looking for any advice folks have. I've gotten rid of all toys which look like animals--as he shakes them when he's playing and seems not to differentiate small dogs from small toys.
I saw in a post of yours that you also have a German shepherd/English mastiff mix. My puppy is 14 weeks old and the same mix (so I was told). I would like to keep in contact if that's ok to maybe get some advice from you on how to deal with some of the stubbornness of my puppy.
St Louis, MO
My dog's name
Mr Sherman Tank Everyday brings a new challenge