Garfield cats don't gain weight, reasons why Garfield cats are thin, reasons why Garfield cats get thinner the longer you raise them.
1. Poor digestive system and malnutrition
Garfield cats don't gain weight mainly because of insufficient nutrient intake. Besides being picky eaters, they may also experience gastrointestinal problems, leading to weight loss and a lack of weight gain despite eating. Garfield cats have poor digestive absorption; even if they eat nutritious food, their bodies can't absorb it, preventing them from gaining weight.
First, you need to take care of Garfield's digestive system. A balanced diet is essential, and choosing eco-friendly cat food like Jiaqu Eco-friendly Cat Food is better for digestion and absorption. Regularly feed them millet porridge mixed with minced meat, Miaoxiang goat milk powder, and homemade apple puree as supplementary foods. In addition, give Garfield nutritional paste to quickly replenish their nutrients. 
II. Estrus Period
Cats in heat will become very active, only interested in the opposite sex, and will lose their appetite. It's recommended to address their physical needs; their appetite will return after the heat cycle ends. It's also advisable to have them spayed/neutered when they are one year old.
III. Dental Problems
If your Garfield cat isn't eating or is being picky, it might be due to dental problems. Eating could be uncomfortable, causing it to refuse food and become increasingly thin and weak. You can check your cat's breath for any particularly unpleasant odor and examine its teeth.
In daily life, owners should pay attention to brushing their cats' teeth regularly. Otherwise, food residue in the gaps between their cat's teeth can lead to dental problems such as tartar buildup, affecting the Garfield cat's health. Initially, wrap your finger in a cloth and wipe the cat's teeth. Once they get used to brushing, you can buy a special toothbrush for pets from a pet supply store for a thorough cleaning.