Bulldogs World

On my way to vet now, just thought you guys could give me some ideas what might be going on. Toby is 8 years old and has been sluggish lately and has lost weight over the past few months. I took him out this morning and noticed he is peeing blood and its a pretty good amount of blood, not just a light stream. He's also been constipated lately so I'm really freaking out and scared it could be very bad. Is there a chance it could be something easy to fix?