changing behaviour- worried

Buddy is now 14 weeks on Friday and has been going out for walks for 3 days now doing OK still a little nervous of things but expected .. However, I notice his behaviour is changing in certain areas and I am not sure how to respond.

1. "Give" - he has never been wonderful at giving up something he wants , but we could give him a treat and he would release or distract him and the same would happen, but recently he will not give until he wants to
I asked a dog trainer to come round and give me some tips on basic training , and she held the toy tight not allowing Buddy to pull and he got bored and let go ..I tried this and for a couple of days worked fine, but now nothing seems to get him to give on command - last night I held his rubber toy for 30 mins with him becoming more and more aggressive( aggressive is probably not the right word but he was growling and pulling harder and harder) until he finally let go and tried to nip my hand and continually tried grabbing the toy and my hand , as I was putting it away to stop the game - other times he is happy to bring a toy , let you take it and play fetch or just general play , same with food /biscuits ..but I think it is starting to become on his terms rather than ours as to when he will release .. something I need to stop developing , as he often has things he shouldn't have and I am having trouble getting them back

also linked to this is his behaviour to our cat - to start he wanted to play and of course the cat put him in his place- then he started chasing it again the cat responded ,but I have noticed that the last few times he has tried to bite the cats back leg to grab it as it is running away - he doesn't show aggression , so I think still a form of rough puppy play but he will not leave on command - he will only leave if you physically go over and stand next to him , he will then walk away and try again .. until the cat gets away ..I am scared he will catch him and not release him when told.- we never leave them alone together and this mainly happenes when they are both in the garden

the other issue is

my husband will be sitting with his feet up on the recliner and for no reason Buddy will go over jump up and bite his feet .. no amount of distraction or telling him no or ignoring him, will stop him he just starts barking and jumping and nipping in the air in the hope he will get him - he does not do this with anyone else.

Both these things seem worse when he is tired and the only way to calm him is to crate him and then he falls asleep - which is fine but I do not want to use the crate as punishment for being naughty for obvious reasons, he doesn't take himself to his crate to sleep of his own accord despite it always being open ..but will get in it if called to do it unless he is having one of his naughty spells when I have to physically catch him and put him in it .. any ideas how to solve these two issues .

I get the fact he is a very strong willed little man and is pushing the boundaries , but am not sure what to do , I am particularly concerned at the lack of willingness to give/leave

help needed please

We used the treat distraction method with Suki. It took allot of patience but it did work. Suki will also go after my feet especially if she wants to play. I just ignored her or placed her in a time out, essentially the opposite of what she wants nd over time she learned this was not how to get attention.

Any training limit to 10-15 minutes per day the leave command will take time just be firm with commands , id also try some games as a a means of tiring him out as hes a bit young for a long walk. When hes tries to bite just get up from where you are sitting completely ignore him when he stops trying to nip and is calm give him a treat and plenty of praise

The nipping of the toes is wanting to play, remove the toes. When I say remove the toes don't cut them off the OH wouldn't like it but when Buddy goes for them get the OH to put them out of sight or on the floor so that Buddy doesn't see them or can't try and play with them.

My Flo is terrible with the "Give" command but something to try if simply holding it doesn't work is to lower the toy to the floor and simply keep it there until he lets go, then remove and reward.

All normal puppy behaviour . If its getting too much you can give time out but never in the crate. All puppies love toes ! It will get better when he can go out for longer and release all this energy.

Marley is the same with things he doesn't want to give up, usually something he's not supposed to have my socks I just hold them and say drop till he does. I give him lots of praise then tho for giving them up

buddy is getting the idea if I put the toy on the floor he will let go but only when we are playing - the issue I have is that if he has something he shouldn't have he runs away as you approach him have tried running away from him to chase me but he just watches me go! - so even offering him a treat or another toy is impossible - luckily so far he has not got anything that will hurt him if he takes a bite out of it but....

if he has a toy have a treat in your hand say your command ie leave when he drops the toy give him a treat use a high value treat such as sausages and use only for this purpose. id also practice the leave cmmands at random times and only for 0-15 minutes at a time they tend to lose their concentration after this and see it as a chore.