Caraline makes some very good points here.
I know it can seem to us owners, in our frustration, that the dog is to blame -- but remember, a dog relies
totally on his owners to teach him consistently and carefully what they want from him. If he does not understand what he is supposed to be doing, it is because the teaching has fallen short -- either the message wasn't received clearly and/or there wasn't enough follow through over time to make sure the message was always followed. In other words, it isn't the dog's fault when we have failed to be consistent enough in training
to always set the dog up for success that can be rewarded. That means
never ever allowing the dog to be in a situation where our lack of supervision causes him to fail.
When it comes to the all-important area of housetraining, a dog needs you to follow a nonstop, consistent programme over many weeks of
never letting him out of your sight or out of reach unless crated until you KNOW the dog is housetrained. Most people mistakenly think their dog is housetrained after a very short period of success. But this generally takes a full year to reach a point where there won't be occasional accidents. At 8 months he is still well within the framework to be having accidents, and simply cannot be left to get up and down on furniture by himself without someone within arm's reach. I know he may look grown up, but he's still just a baby.
Setting aside illness, housetraining problems happen because after some initial success, people slack off too soon and leave the dog to roam around out of sight and stop taking the dog out themselves, supervising every job outside, and rewarding. If he is consistently going on the sofa there are only going to be two possible reasons, and maybe both apply:
1) people didn't watch him carefully enough, and he has been peeing and defecating there consistently, and no one has used proper enzymatic cleaners to totally remove the scent that tells him it is the right place to go, he thinks that is where he is supposed to go. The very fact that he has done this numerous times in such a prominent place before anyone can stop him or even sees him going, indicates he isn't being watched enough.
2) He has been punished for going inside -- which means he now probably thinks the wrong place to go is
in front of you -- not that the wrong place to go is
inside. So by punishment he has learned to find someplace where he isn't being watched and smells like his poo place because of previous accidents... and go there.
So what now? If you don't have it I recommend immediately ordering Shirlee Kalstone's book on housetraining and following its instructions precisely.
I'd have your husband read it cover to cover. He needs to be part of the housetraining team (he needed to be watching the pup through its housetraining too, of course!).
Housetraining takes a LOT of hard work and time. So does obedience training, to have a good canine citizen. You have many things before you with your dog and he will need constant commitment and training -- really your relationship with him is only just starting -- hence you need to think what all of this means to that longer term commitment.
So, on a very serious note: if your husband truly feels accidents during housetraining are grounds to get rid of the dog, then you probably do need a very serious conversation about whether having a dog fits both of your expectations and is the right choice to have made. Dogs have all the flaws that people do (and a few more that we manage to teach them through our own ignorance of the best way to communicate with them!). Dogs are always going to have the occasional accident especially when ill, are going to chew or destroy, or vomit inside. In this they are
no different than children, who will do all the same things. No one expects small children to be perfect and we can actually talk in the same language to them! But we recognise a child is only going to ever be the product of its upbring. The same with a dog. The dog we get is the dog we train or fail to train. If the will isn't there on all sides, by all family members, to take the time and the effort or it is too hard for whatever reason to make that time, then the dog is not going to improve.
Hence you have a decision to make and that will require some honest soul searching. If this is really going to be an issue permanently and one key member of the family wants to rehome the dog, then 50% of the will to train is not going to be there. If the dog is only there on tolerance, it also will not be a joyful experience for the dog or for the owners, and the dog will only likely cause further strain between the humans. This isn't uncommon -- I see this all the time in rescue -- and generally if one person already has real doubts, eventually the decision will be made to get rid of the dog. Rehoming a dog gets more and more difficult the older the dog gets and can become more traumatic for the dog.
So for your dog's sake and for your sake, have a good, long, honest talk and see where you both stand... and if this isn't the right time to have a dog, consider contacting breed rescue. BruceH and his wife Kris are involved with rescue in your region so you might PM him to further discuss the issue and get some advice.
Incidentally at this point you may need to get rid of the couch to successfully complete housetraining with him -- it may now be deeply penetrated by urine smell that keeps indicating this is where he should go. Once or twice you can use a cleaner but if this has actually happened many, many times, the couch will be permeated with this scent. I'd at least consult with a professional cleaners capable of handling deep urine stains to see if it can be salvaged.