First of all, STOP dog day care. That is not socializing. That is letting a puppy who should be bonding to you continue to form relationships with other dogs. You want the dog to want to be with YOU.
This leads to the next issue.. it sounds like you need to work on your relationship with the dog. NOBODY likes to heat this news. This starts at HOME. When this dog has a toy at home does he take it and leave you or does he come to you and ask you to play with him? If it is the first thing (grabs a toy and leaves) then there is your answer. This is where you start. YOU need to be more interesting and more fun.
When you take your dog out and he lunges towards other people and dogs I must assume he is doing so in a friendly manner. While this is normal puppy behavior, it also indicates that you are not very interesting and not as good an option as "that over there" which is much more fun.
I think you need to take a step back and work on your relationship with the dog. A dog that stops is giving you information. That information may be that "out there" is a bit overwhelming and he does not have enough of a relationship with you to trust being with you as "safe."
This leads to the next issue.. it sounds like you need to work on your relationship with the dog. NOBODY likes to heat this news. This starts at HOME. When this dog has a toy at home does he take it and leave you or does he come to you and ask you to play with him? If it is the first thing (grabs a toy and leaves) then there is your answer. This is where you start. YOU need to be more interesting and more fun.
When you take your dog out and he lunges towards other people and dogs I must assume he is doing so in a friendly manner. While this is normal puppy behavior, it also indicates that you are not very interesting and not as good an option as "that over there" which is much more fun.
I think you need to take a step back and work on your relationship with the dog. A dog that stops is giving you information. That information may be that "out there" is a bit overwhelming and he does not have enough of a relationship with you to trust being with you as "safe."