Hello! We have an orange tabby that does better with a friend. Adopted him from the shelter, and his best pal from the same shelter a week later. We have had them one year. This past week his friend (and my soul mate kitty) passed away unexpectedly. Both are (and were) 3 years old. We adopted a 6 month old kitten for a new friend for him a couple days later. He seems to have accepted him. They sleep together, he grooms the kitten. However, he has begun to meow a lot, and when the kitten plays he will sit and meow at him. Sometimes it is cute trills and sometimes it sounds bitchy. Should we be concerned?