That is foot/hoof rot and not EHD IMO. I have seen many deer with hoof rot over the past 13 yrs now. Common amongst bucks this time of the year.
Could be. We had wondered about that also but felt like weather conditions aligned more to Blue Tongue. We had a super wet spring and early summer and have been basically drought since which is perfect for Blue Tongue. Read that Hoof rot need consistent wet weather. Either way, sad way to end
Weather conditions in the winter months are not what I have seen for Blue Tongue or EHD. Small biting flies are what spread it and they are not as active in the colder months as they are in the spring to fall times IME. IME hoof rot does not need wet weather, as I have seen it in wet years and dry years that were back to back. Hoof rot was more common in the fall months when the bucks were in the rut. A small wound or cut allows the bacteria that causes hoof rot to get into the body. Wet weather makes the skin of the deer easier to cut but in the rut bucks fight and cut themselves all the time. A bucks hooves take a beating in a fight and rocky soils are worse yet. Areas around feeders, food plots, scrapes, etc where deer congregate allow deer to be exposed to the bacteria easier. On a ranch(lot of flint rock gravel) I managed I found 18 bucks with hoof rot or died from it(during the rut) the first year it started. Those that survived had part or all of a hoof missing. I only found one doe and one fawn with it . Of the few bucks that survived it some of them got hoof rot again the next year and had antlers that were deformed from it. Over that 2 yr period I found over 24 bucks dead from hoof rot issues. The worst was a 5 yr old buck that had it on three hooves. Seen a few bucks with one front and one hind leg with it and none of them survived. That county and surrounding counties had well over 100 reported cases of hoof rot that first season. The TPWD biologist wrote a really good article for the local newspapers on foot/hoof rot in the local whitetail deer herd. This was in Colorado County back in 2008 or 2009 time frame. I also found 2 bucks with hoof/foot rot on my place in Goliad County back in 2015 IIRC. Both of those bucks were never seen again and I assumed died from the infection or the rut got them or coyotes got them. I have seen hoof/foot rot on 2 bucks in the summer time but was not sure exactly what season of the year they got it in.
IMO, the deer in your photo has had hoof rot since part of the hoof is missing and the rest of the lower leg is full of puss. If you find a deer dead or kill one with hoof rot, you can grab a hold of one of the hooves and pull it off the foot. When it pulls off the foot it will feel the same way as when you are cooking chicken on the bbq pit...you grab a chicken leg and the bone and meat fall apart. IMO, this buck has had hoof rot in the past and already lost the hooves. He healed up and then got hoof/foot rot again. If you grab the hooves and they easily separate from the rest of the leg/foot then you have foo/hoof rot.
I am not a vet nor a biologist and these observations are from my experience in the field. I have spoken with veterinarians, biologists and feed nutritionists about the issue and what could be done to slow or stop it.
EHD/Blue Tongue are commonly found in Texas. The areas SE of San Angelo had a major outbreak of it about 13 yrs or so ago now. I had a friend who had it on his ranch and he lost a lot of his deer from it. Some survived it but he lost a lot of deer. He told me about other ranches that were experiencing the same thing he was. It was usually in the spring to summer to early fall months it happens.