Hello again and update on Scout....

I posted here several months ago about Scout my approx 6 yr old black cocker mix who was losing weight.
I attested this mostly to there being another dog{stray}introduced in the house around the same time as he started losing weight but lately his fur has been lifeless and dry and well as thinned out in some areas.
The vet did a CDC count which was perfectly normal and a T-4 test which gave a low result of 2.0
He was prescribed thyro tabs at 0.2 mg per day once a day.
He has been on them 4 days and seems to be in better spirits and the dry skin already looks to have improved slightly{i started him on vitamins the same day}.
His normal weight is 18-19 lbs and when he went for the lab work he weighted 13.8 lbs.
He seems to be eating better but still seems intimidated to eat around the newer dog so i have been feeding him by himself and he eats approx 3/4 to 1 cup of food a day.
Ive been looking into supplements to help him gain weight quicker and heard of something called nutri cal and also someone recommended satin/meat balls.
I have to take him back for a check up in 30 days and hope that hes gained at least a tad bit of weight back before then.
Any thoughts on nutra-cal or can you recommend any weight gainers?
Thank you!