You may want to think about your no spray policy. Is this tree in the full sun? I don't know of any fungicide spray that would be harmful to your dogs. Al

Carol, your problem looks like pear leaf blister mite, but it could also be pear scab. If it is the blister mite then the black spots are the already-eaten parts and on the newer leaves you should see pinkish spots. If it is scab your new leaves will probably be clear this time of year. You also have some pear rust on there, the red/yellow spots. I would look for these things I mentioned and also use the Google image search to look at pictures of these things I mentioned to help you match them.

Whatever you have the main time you need to spray is in spring to prevent it, so next spring will be the time when you can get rid of this. I agree with Al that there is no problem with the dogs, just don't use bug poisons like Sevin Malathion etc.

Scott

Serenade and Compost tea are ways to take care of those things without poisoning your yard.
John S
PDX OR