Apologies for not replying earlier, and for the following short reply. I have been off the computer being busy with couple important issues. And I am sorry the kittie isn't feeling well.
First question or remark is about lamb/pork diet. I understand that according to your description the cat has been well on the diet. But actually, these meats are not recommended for cats because of their high fat content. The rule of thumb when it comes to species appropriate diet is to think what an animal would be eating in the wild. And they can't really hunt sheep or pigs.
If the cat does eat these meats, his liver should be monitored in order to check if there is no fatty liver. Actually, that's the next question, if an abdomen ultrasound was done.
Also, the remark about taurin is an important one. As it happens, unbalanced natural diet is worse than commercial diet. Here's a link to Dekart's site, where you can get all the needed information of how a balanced natural diet for cats looks like.
He mentions chicken and rabbit, and turkey is a good option too.
And here's another similar version of the diet:
As for his howls, it would be more understood if the kittie would be older, as this is one of the signs of the gradual cognitive decline. But he is too young for that.
What draw my attention is constant licking all over, a sort of hyperesthesia. It could also be a sign of pain. And also a howl when trying to eat, and that he eats if you feed him. I don't know how he is in general, I mean if he is playing, jumping, running around. It seems like you say that he is ok and does all those things. Well, then it does sound mysterious, because this kind of howling could be an indication of pain, perhaps in the neck area, and that's why it's easy to eat when you feed him.
And if he has chronic vomiting, then you do need to do an ultrasound if you haven't done so already. Just some thoughts.
First question or remark is about lamb/pork diet. I understand that according to your description the cat has been well on the diet. But actually, these meats are not recommended for cats because of their high fat content. The rule of thumb when it comes to species appropriate diet is to think what an animal would be eating in the wild. And they can't really hunt sheep or pigs.
If the cat does eat these meats, his liver should be monitored in order to check if there is no fatty liver. Actually, that's the next question, if an abdomen ultrasound was done.
Also, the remark about taurin is an important one. As it happens, unbalanced natural diet is worse than commercial diet. Here's a link to Dekart's site, where you can get all the needed information of how a balanced natural diet for cats looks like.
The complete diet for cats
This diet is designed to approximate the normal, natural diet that cats would eat if they lived in the wild. It is based on 'live prey' diet as the only species apropriate diet for our feline friends.
www.vetmalta.com
He mentions chicken and rabbit, and turkey is a good option too.
And here's another similar version of the diet:
Feline Nutrition - Feline Nutrition's Easy Homemade Cat Food Recipe | Hare Today
feline-nutrition.org
As for his howls, it would be more understood if the kittie would be older, as this is one of the signs of the gradual cognitive decline. But he is too young for that.
What draw my attention is constant licking all over, a sort of hyperesthesia. It could also be a sign of pain. And also a howl when trying to eat, and that he eats if you feed him. I don't know how he is in general, I mean if he is playing, jumping, running around. It seems like you say that he is ok and does all those things. Well, then it does sound mysterious, because this kind of howling could be an indication of pain, perhaps in the neck area, and that's why it's easy to eat when you feed him.
And if he has chronic vomiting, then you do need to do an ultrasound if you haven't done so already. Just some thoughts.