If it is a full blooded 'yote, it won't go anymore than 60#
If it is a Coy-dog, it will go bigger, depending on the breed it mixed up with.
My property borders Nickerson Statepark on one side, and a landlocked area between me and the park on the other. Have gotten to know our area's 'yotes patterns well, as I have walked all the fire roads for years. Healthy they are, and not as nocturnal as peole think, just real stealthy. Bold is the word, for behaviour, especially once they know the habits of the neighborhood.
The local Alpha, nice full coat, he looks like he might go 90#, but I am guessing it is just the way he carrys himself, and his full healthy coat, I have seen him fairly close, and realize he probably goes no more than 60#. they are wiry and all muscle under that fluffy jacket they wear.Bob, I am guessing, but, I think he was just curious, as to WTH you were doing.
If he walked away calmly, I doubt he was rabid, he would have been in your face, or some other part of your anatomy.
BBJ & I last year, out at the Race, we had a couple 'yotes go by us within petting distance. Stealthy and Bold.. if you fish sand eels do not leave your bag swingin from your sand spike..

.. I witnessed a guy come unglued more than once over what happens.. the funniest was the guy who while rebaiting, actually touched the 'yotes snout as he was reaching back into the bag.. he screamed like a little girl and ran damn near a mile down the beach.. can't say as I blame him, but he should have known better. 'yote didn't snap at him, or chase him, just kept after the sand eels till they were gone.
Fox too, on the cape, and the beaches.. years ago, bunch of guys fishing camper alley down at Nauset. Slow night and some booze was being drank. they started a card game in the camper, one guy left his rod baited and out... tide going out.. well, after a while they hear drag, a lot of it, they go out and he starts reeling.. one of them notices it is dead low tide.. they shine a light on the line.. it is headed up to the dune line... guy is reeling in a small fox with a high low sand eel rig in is jaw!