The biggest problem we face is other dog owners and people. Guide dogs are trained not to run off and picked so they don't have high prey drive, so walking them is pretty easy. When we're walking our dogs, we use our cane, thats why only people with good orientation skills get a guide dog. Sadly, there will be other dogs who are aggressive, people who feed the dog without you even noticing them... Basically, if your dog is attacked there's nothing you can do although I bet 99% of blind people will do anything to protect their dog, even risking getting injured. All the problems I face with my dog are people made. I'd say 50% of guide dog training is preparing the dog for acts of sabotage by others, be it their dogs lunging and barking at ours or letting their aggressive dog approach us. You can't imagine how often I cannot enter a shop because an aggressive dog is tied to a pole next to the entrance and won't let us in or how often I need to cross the street because I will not force my dog to walk by some dog they perceive as a huge threat.
Most people have someone sighted who takes a look at their dog's body from time to time, but you are encouraged to build a routine of inspecting your dog with your hands to notice injuries or ticks or them getting overweight.

You're going to have to be a little bit more speciffic. We probably do it the way any pet owner would? What in particular would you say might give a blind person pause?