I've done some work around Scranton and State College. I agree the trails are very rough and rocky. Be prepared. I visited many of the State Parks in the area and had some great runs. I always had my dogs with me, off leash, and no hassles.
There are tons of deer- be ready with a good recall. The area is overpopulated with deer. There are a bunch of black bear, they should be in hibernation but I've never seen an area with so many black bear. Porcupines are dense, too. Basically, make sure you have good control of your dog.
The ticks should be gone, but I'd be real careful and make sure to treat your dog if you see any- you will not get them all. Deer ticks are tiny and on a large, coated dog you will miss some. My GSD got Rocky Mountain fever (tick disease) from field work in PA. It was super scary. The ticks were really bad.
I highly recommend the State Parks. Blue Knob was among my favorites, also Promised Land, but there are many, and they are well maintained, have lots of trails and are dog friendly. It's a decent area to hike, but don't expect any "real" mountains, it's more rolling hills and ridges- but nothing wrong with that.
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