My name is Henri the Great!

We are sad to say but we need to rehome our dog, Henri the Great, who we have had for 3+ years, he is about 7 now. We rescued him from a friend who passed unexpectedly, him and Henri were not found for 3 days, so it stands to reason Henri hadn't eaten or been given water for three days.
Henri has separation anxiety & howls for 2-3 minutes when left alone & sometimes randomly. He can be a bit aggressive w/ food. When we feed him he growls and if we were to take the food away he protects it. When given a bone and doesn't finish it, he will protect it & growl if someone is to walk by or try to take it from him. He sometimes has accidents, I would say once a week; mostly just pee. He can be a bit feisty with new dogs but typically depends on demeanor of dog.
Other than the above mentioned issues, Henri is a very calm and loveable dog. He loves getting love, pets and cuddles and going for walks. We take him for 1-2 long walks and 2-3 short walks.