Ok, let me ask you this question...does your dog urinate on the trees? I would also ask the same questions about your blue spruce now that I know you have a dog. I used to work at a veterinary clinic and in the landscaping was a bird's nest spruce that would continually get urinated on by the dogs. It died as a result. I think it had to do with the acidity of the urine.
The ash looks like it may have a canker. Cankers can either be caused by bacteria or fungus. You could try treating it but it looks pretty large for such a tiny tree.