The reasons why dogs have tear stains:

1. Dogs are born with narrow and blocked nasolacrimal ducts, causing tears to only overflow from the corners of their eyes, which is prone to Tear stains.

2. Excessively long eye hair, inverted eyelashes, and ectopic stimulation of the eyeballs can lead to excessive tears and easily form or aggravate tear stains.

3. Eye infection, dust irritation, inflammation, etc., cause the dog to shed tears and form tear stains.

4. Improper diet, eating too salty and greasy, and poor dog food containing allergens, chemical additives, etc. can cause dogs to get angry and produce tear stains.

Methods to remove tear stains on dogs:

1. Use antibacterial pet wipes or a combination of soapy water and medicinal cotton, and wipe frequently Look at the dog's tear stains.

2. If your dog sheds tears, you should wipe them dry as soon as possible, otherwise tear marks will easily form when they dry.

3. Take good care of your eyes. If your dog’s eye hair is too long, trim it in time. Trichiasis and eyelash growth can be surgically removed.

4. You need to clean the dog’s eyes with eyewash first, and then wipe the dog’s eyes with a wet tissue.