Our lovely lab x is c.12 years old (he's a Battersea rescue dog who we've had for 10 years). He's deaf and arthritic and, whilst he's on medication for the arthritis, he struggles to walk far and I think is in some discomfort. He's a much loved dog and has been so faithful to us but I fear the wag in his tail has gone and whilst he still eats well, he just lays in his bed all day occasionally making it to the living room of an evening but that's about it.
My question is when's the right time to have him put to sleep? Our vet told me that 'we'd know' when the time came but neither DH or I are sure :(.
Anyone being in a similar predicament and have any advice?