Solutions to gain weight if the German Shepherd is too thin:

1. Deworm the German Shepherd on time, because parasites will absorb the nutrients in the German Shepherd.

2. To help the German Shepherd regulate his stomach, it is recommended to feed the German Shepherd pet probiotics occasionally.

3. For a German Shepherd in an embarrassing period, the owner only needs to ensure that the German Shepherd receives sufficient and balanced nutrition.

4. If the German Shepherd has poor physical condition, it is recommended that the owner take the German Shepherd to exercise more and get some sunshine to promote metabolism.

The reasons why the German Shepherd is too thin:

1. When the German Shepherd is severely picky about eating, it will lead to weight loss.

2. Parasitic infection in the dog's body will cause loss of appetite, vomiting and diarrhea, which will cause weight loss.

3. German Shepherd dogs are unable to eat due to stomatitis, foreign bodies in the mouth, pharyngitis, etc. and then become weightless.

4. German Shepherds have viral or bacterial infectious diseases, such as canine distemper, canine parvovirus and other diseases, which can lead to anorexia and weight loss.

5. Poor gastrointestinal function of German Shepherd dogs can cause gastrointestinal diseases and lead to weight loss.