More: Merlo was taken to the vet to be euthanized. The vet contacted me and disclosed four medical concerns. Merlo is a healthy 8 month old puppy. This photo is a 3 month photo to celebrate young puppy rescue to current beautiful 8 month old puppy. (Can provide current photos) We had an empty home after our 15 year old Welsh Terrier was putdown. Merlo has filled our home with love and loyalty.