I've been getting so many complaints from my brother about how his German shepherd is always having flea problems. Even when he just recently treated him of his fleas, it didn't take 3 months and the fleas came right back.
What could be the cause of this or does German shepherd have a more constant flea problems?
I believe that this is a general problem for all dogs especially when you don't take very good care of them and groom them when they are supposed to be. Fleas will definitely find a way to get into them.
I have no answer on that because animals have flea especially dogs. I remembered when I was young, I will see my uncle sitting down with his dog, checking all over his body, killing something that looks tiny with blood in them. I grew up to know that's a flea and it tends to hide in dog's hairs.