I'm very sorry for your loss and hope you can take some small comfort in that you did everything right, and the dog lived to a ripe old age (speaking as someone who worked with animals for years in a professional capacity + also an ex-dachshund owner). I would strongly recommend against trying to detect/treat cancers in dogs of that age, they tend to come back and the repeated surgeries are massively stressful.
tw: animal death / pet death
I'm very sorry for your loss and hope you can take some small comfort in that you did everything right, and the dog lived to a ripe old age (speaking as someone who worked with animals for years in a professional capacity + also an ex-dachshund owner). I would strongly recommend against trying to detect/treat cancers in dogs of that age, they tend to come back and the repeated surgeries are massively stressful.
I'm so sorry to hear about Oscar <3