The first photo of the dog almost looks like moisture buildup, like the emulsion was sweating when the exposure was made, then it was rolled up into the paper. You commented the film was fresh, was it ever frozen before you got it? Given what I have seen, I would concur with Thomas that it wasn't fully thawed out. The damage is physical in nature, reticulation doesn't do that (heat) from temp fluctuations. The last photo is the strongest evidence of this concept.