As it turned out i am a little bored, wearing worn out tennis shoes, the dogs need to go out, and have a patch of dirt available in the woods behind my house. Here is a print of me running and jogging through the moist ground. I also walked across it but left no visible print. I was able to generate the vertical lines seen in your print. However, my running print was very short as I was on the ball of my foot. The jogging print is closer to yours but you can very clearly see the rounded toe box and heal impression. Your print looks closer to a barefoot bipedal jogging. Unfortunately I did not have a good spot to try that out. The most logical answer is that you have someone using your property to practice their cross country track. Does that sounds feasible to you?
The fact that you took the time to find this site and post your pictures says that you are concerned that you may have a bigfoot lurking around that could endanger your animals and even family. So with that said a few more questions and thoughts for you:
Is there anything else going on beyond the prints that make you think there is a BF in the neighborhood?
If the area is fenced in, follow the trail as best as possible to the fence (going and coming) and see if you can spot any hair stuck in the fencing. If you do, take pictures of it and then collect it with tweezers and gloves and drop it in to a plastic bag and send me a PM.
Those are some pretty mountains in the background. I assume that is a wilderness area and a good place for an animal den. Not sure if you have any hunters in the family, but I would definitely scout out that area to see what I could find.
If the mountains are his destination, can you tell where it came from. By any chance do the prints lead back to a barn that is missing some horse sweet feed? Also to the prints come and go or just pass through your property in one direction?
BFs end to be scavengers when food is scarce. Make sure you have no food left out and available to him.
If you think it is a BF and want to get rid of it, mount a cheap trail cam. That will guarantee he/she will never return.
Are the blackberries in season? If so, I think we know the answer as to why he just started showing up recently.
I would stay outside late at night for a few nights and see if I could here any weird howling or moaning. Google "Bigfoot Howls and Moans" to get a sense of what people think a BF sounds like. If you hear them, try to record them an post them here.
Good Luck. I am not on the site often these days so feel free to send me a PM if you want to discuss this further. I had a daughter spy a BF standing outside her bedroom years ago and know first hand how concerning that can be.