Speakout
I disagree.
I don't think this old dog is cared for very well at all, and certainly does not sound like the OPs " absolute world"
He had been a solo dog.
A new puppy was brought into the home ( dog number two).
When that dog reached adulthood ( 12 months) fighting started between the two dogs.- I imagine that the aggression would have started before that- but was brushed off as " puppy play" or at least not tackled and dealt with effectively.
At this point the OP should have taken action- consulted a vet, a behavourist, castration, or even rehoming the new dog if the situation could not be resolved.
But no, she let the situation drag on for several years,, the dogs still having the odd fight and having to live apart- but presumably in the same house.
This is a stressful situation for bot dogs. Having an aggressive situation, the two dogs will be able to smell and hear each other.
This is stressful in itself, never mind having fights.
So not only did the OP fail to deal with the situation, she allowed it to drag on for a couple of years, making a miserable life for the two animals.
So then bingo- the bright idea of getting a third dog- Genius!!!
OP you have failed these dogs, especially your oldest dog many times now.
You don't sound ;like an animal lover to me, otherwise you would take action to ensure that your animals can live in a peaceful environment.
(Not sure how to make the above bold)
Let me clarify almost all of the points made on your post above Speakout.
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We originally had 2 dogs before the puppy joined us 4 years ago. Both kids started school so we went to a very well known rescue to get the puppy as I would be at home. (Pre working full time)
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All 3 dogs got on exceptionally well for the first year. The puppy came into maturity and the fighting started. We got the older boy neutered followed by the puppy a few months later. (Didn't help)
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Both dogs had obviously been vet checked pre neutering. I then saw 2 behaviourists, both of whom recommended rehoming the puppy. I originally spoke to the rescue we got the pup from who put him on the waiting list to return. I then spoke to someone who used to work there who very adamantly said don't return him to the rescue. So we didn't. Spoke to other rescues who put him on there waiting list.
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The dogs that fight haven't seen each other apart from when we try them together. They live in separate parts of the house.
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We lost our female last year to cancer, the pup shared the same part of the house with her and was getting depressed hence getting the new puppy.
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Anything I have missed Speakout?