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Hi, Welcome to Just Answer. I'm Chris, a small animal Vet based in the UK. I am reviewing your question and will get back to you as soon as possible
sounds as though Leo at this stage is being a typical puppy. He has learnt that biting elicits what he perceives to be play behaviour. There are several things that you can do,and certainly what you have done so far is all positive so continuing to reinforce good behaviour by treat rewarding and ensuring not to give a reaction to bad behaviour. Replacement of him attacking people with toys or a chew is good, if this isnt working what can work really well is response with an "ouch" in a high pitch loud response will normally elicit a reaction from leo that shocks him/reacts to stop what hes doing. I actually have a lurcher myself who is now 3years old and she certainly did this at 12weeks old. The behaviour he is also doing as he will be teething from 4-6m old so this is normal for them to want to chew and bite but we want to control it early on.
The best thing is to completely ignore this behaviour. Only give fuss/attention when all 4 paws are on the ground. He will soon learn that the behaviour doesn't elicit a 'response' from you and therefore is no fun!
Keep me updated and let me know how you get on! Keep drawing on the positives of having him as the behaviour will soon settle, it can be hard work to start with but will be worth it.