We also had an English Springer, who when she turned 2, turned on us, but was great with strangers
even with a person who broke into our home :o
After much searching, it seemed there was a question of her breeding and color (she was mostly liver and they can get aggressive ?).
Even the hunters wouldn't take her (she was a bird dog); sadly we had to put her down.
Once Penny has passed we won't get another dog; we saw what happened with my in-laws, who got a dog in their 70's; in their 80's they both ended up ill and eventually in nursing homes.
The poor dog was grieving for them, and had the stress of being bounced around between our home and theirs
Thankfully hubby and I could take him in (14 year old shih tzu) when they could no longer keep him; he knew us well, and had 1 happy year before he passed on.
We don't want to stress a dog out like that again, and we don't have any relatives that could take Penny.