Help please!
We have three dogs - two small ones who have no issues and one large crossbreed puppy who is 7 months old now.
Puppy is housetrained and knows lots of commands e.g. sit but has so much energy he can only do a command for a second before going back into crazy mode. I WFH mostly and only go in when DH is home so the dogs are rarely left alone. Puppy needs strict supervision at all times as he will swallow whole anything he can fit into his mouth. He runs around and knocks both children and adults over all day. He has a crate for his safety at night but of course he can't be in that too often, although the crate is the only time he and we are safe. He is not nasty and has never bitten or growled, but will bulldoze anyone or thing in front of him as he is very big and strong and oblivious. He does not at any point lay down for a cuddle etc. He absolutely flattens the other dogs. The dogs are walked but the smaller ones can't manage the same speed or walk length as the puppy who wants to run fast which causes issues. I do take the puppy for a long run of a few miles 2-3 times per week but I am too exhausted to manage more often and it doesn't seem to make a difference as he has just as much energy after. Daily life is becoming so hard as he's harder to supervise than a toddler and I'm struggling to work when he needs so much supervision. I expect to have to dedicate time to a puppy but its been continual for five months and training isn't improving things.
There was a recent incident which has damaged my bond with him. I know he didn't mean it and it was instinctual but despite normally being closely supervised in the garden which in itself is exhausting, he managed to break into the rabbit run (which is fox proof and I am very surprised he got in) and he mauled one of the rabbits. Despite reinforcing the run and digging it down, he now breaks into the rabbit run daily even while supervised as he just refuses to come to call when trying to break into the run. Its an expensive run but where the damage each day is repaired its getting progressively weaker and I don't want to buy a new run as he will immediately destroy it. I tried putting a second cheap run around the first to protect it but he destroyed it in minutes. I can't keep him on the lead in the garden as he likes to run up and down the full length of our very large garden constantly and I think restricting his movement would just make his overexcitement worse. We can't have visitors anymore as he cant be left unattended while seeing a visitor and he can't be let out while visitors are here as he will hurt them with his jumping/continual running into people.
DH suggested speaking to the breeder about taking the puppy back. I've never rehomed a pet and I feel very ashamed to even consider it. I don't want the puppy to feel unloved or rejected. I don't know what to do but I've been reading about cross breeds sometimes getting bad traits from each breed and never calming down. For months I've coped by focussing on how this is short term and he will calm down, but this level of energy is something I've never experienced in a dog and I'm really worried its going to be forever.