I have a male presa canario ,intact,I was given him by a friend of the previous owner ,who had passed away suddenly , and was aware my own dog had recently died.He is a large dog about 2.5 years old and a very strong one too.I am guessing he was not socialised very well early in his life as he tends to be reactive to other dogs tho this has improved considerably with plenty of long on leash walks, and i'm no longer pulled to the ground looking like an idiot holding his lead.He has on a few occasions gotten off leash and ran over to other dogs and is not aggressive with other dogs and runs back to me if they are agressive to him he runs back to me .He stayed with a friend when I went away and was dominated by their male tea cup chihuahua. go figure lol .He had an issue with trying to chase cyclists and no longer does tho I'm not user this would be the case if he was off leash , I have had him for 2 months and while training is moving forward I don't feel he is ready for off leash training where there are distractions he works well off leash where there are no distractions and has a 100% recall without being attached to the 100 meter lead we started him on .
He seems to have no fear in any situation he is in and is a very reactive dog with high energy levels even after miles of walking (usually 5 plus miles daily at a brisk pace with sit stay and down commands during the walk).

My biggest concern I have had recently came to light when I had male visitors or children wearing trainers.He will quickly approach them or pull towards them if he on his leash.He then goes down laying on his front and starts to bite their feet rolling onto his back and continuing the behaviour.It seems playful tho I'm not sure that it is.It may be something he experienced in his previous home .I now only walk him with a muzzle on until I am able to deal with this behaviour but I'm not sure how as I haven't seen a dog act this way before and feel it may be important for me to understand why he is doing this and whether it is aggression or play before deciding which tools and or methods to use to correct the behaviour .He hasn't injured anyone as yet but he is a large powerful dog with a powerful bite.He has no food aggression and within my home is quite biddable .Any advice and thoughts would be appreciated.
I do intend to have him castrated at some point tho but if this isn't a dominant or aggressive behaviour I don't think this will curb this serious issue .

This doesn't sound like aggression but it certainly sounds like the dog needs more management/control from you.

Actually sounds like a pretty nice dog.

Find a good training class in your area for starts.

My brother got his Presa when it was 3 1/2 yrs old and started doing marker training with him.

No reason why your dog needs to be off lead especially not after only two months training because he's not really under control if he's pulling on lead or running to people.

What sort of training have you been doing with him. At a club or on your own?

I've only done one to one training with him .I have added a video link of one of the training sessions, he gets better as the video progresses .he has a gland that has popped out in his eye that's not an issue but he is so reactive we have delayed taking him to the vets but do medicate to avoid infection .He may look like butter wouldn't melt but I can assure you with distractions he changes .
https://www.youtube.com/watch?v=PYcfoOhXDJA&feature=youtu.be

 Quote: Mark Farrugia

I've only done one to one training with him .I have added a video link of one of the training sessions, he gets better as the video progresses .he has a gland that has popped out in his eye that's not an issue but he is so reactive we have delayed taking him to the vets but do medicate to avoid infection .He may look like butter wouldn't melt but I can assure you with distractions he changes .
httphttp://leerburg.com/groundwork.htms://www.youtube.com/watch?v=PYcfoOhXDJA&feature=youtu.be

http://leerburg.com/groundwork.htm

Have you studied this HELPFUL info & some of the other really great Free articles here on Leerburg?

And I would NOT postpone having his EYE issue treated -- You can get a Sedative from your Vet to give him at home BEFORE going in for his appointment & he can wear a Muzzle for the Exam ... If that eye is Bothering him at all, it could be Adding to his reactivity (???)

I have the same concerns about the eye issue as Candi. That looks serious and should be seen by a vet.

I hope you are doing other types of training besides the fetching and recalling on the long line. That's good exercise, and this is clearly a dog that needs a lot of exercise, but as Bob mentioned above, you should be doing a lot of work on management and control, and not just in the context of being outside running. Using marker training to teach obedience commands like sit, down, stay, come, as well as commands like leave it, drop it, etc., and working on these commands until you are getting 100 percent compliance, indoors and out, even with distractions, will go a long way toward establishing the necessary control.

In the meantime, based on the behaviors you describe, this dog should not be off leash and should not be allowed to be close enough to visitors in your home that he can bite their feet! I am not in a position to have an opinion as to why he is doing it, but it is clearly very dangerous.

This is all JMO based on my personal experience. I am not a professional dog trainer or behaviorist.

The eye condition looks like cherry eye to me. Definitely get it done.
I will add to what's been said about the training issue.
I've seen numerous competition dogs over the years that really sucked when outside the ring.
That's training for in the ring.
When we say management and control that's controlling manners issues by being a good leader/top dog/ whatever.
I absolutely love marker work but the dog also needs consequences for bad or unwanted behavior.

Thank you for the input , it's most helpful >I have no intention of letting him off leash for the foreseeable future.The training on the line is something I do with him before walking him , to drain some of his energy.The maker training looks like something we would both enjoy and seems a more relaxed less excitable type of training .He walks perfectly on the lead at my side , no pulling , until he sees another dog which I feel may be related to lack of socialising early on his life >I have a home visit vet and he is well behaved and relaxed when being examined and she was able to examine him fully and give his shots.The vet is happy to sedate before going for his eye operation , tho she didn't think it was necessary , I explained that she was seeing his good side within the home I have decided to have him castrated at the same time as I have no intention of breeding or showing him . I will update as we progress .He has become lots better in the 2 months I have had him but he has a long way to go still.

Awwww, he seems like a sweet dog. Why don't you check out some relationship games to build your connection to him.

I have a Rottie who does some similarly weird play/rough housing with people. For the foot issue why don't you get him used to playing in a manner that your guests could do (whether that's throw him a ball, or something else) and then if he bites the feet give a correction or redirection and offer to play the new way?

I agree with the others, sounds like a very nice dog you have! He just needs more management.

I used to jog my Dutch by my bike, walking was not enough for him. I would bike him to the school ground or park and then do training on a long line...obedience, agility, nosework etc. If I walked him, he wore a backback loaded with water bottles. Then he would just get more fit and then that wasn't enough LOL

Seems like a nice dog; for an unknown adoptee it could be a lot worse than some leash reactivity issues and a strange foot fetish. You mentioned that you were doing some training but not what type; I 100% agree with the others that marker training and relationship games are the way to go. The dog has fun and you build a bond. I really liked the Michael Ellis videos from Leerburg and would start with the Power of Training Dogs with Food if you are game.
https://leerburg.com/flix/player.php/950/The_Power_of_Training_Dogs_with_Food

Also this one with Tyler Muto for the leash reactivity.
https://leerburg.com/flix/player.php/1426/Leash_Reactivity_with_Tyler_Muto

Finding a class or group like Mr. Scott recommended is also a great suggestion. There are things you learn in group settings that you just can't replicate by yourself.

Best of luck!