Why might euthanasia be considered a compassionate option, and what factors influence timing?

Why might euthanasia be considered a compassionate option, and what factors influence timing?

• A. When the dog's coat color changes; this is not a factor.
• B. When suffering cannot be alleviated and quality of life is poor; factors include prognosis, pain levels, and owner values, with veterinary guidance.
• C. When the dog refuses to eat for one day.
• D. When the owner is away on vacation.

Answer: (B)