I'm Dr. Jo and I'm here to help you with your question about the growth on your Cavalier's eyelid. I'm so sorry he's having this problem and has you worried, but glad you're looking for the information you need.
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Growths on the eyelids of dogs even at this young age are not uncommon. If this was the result of something like a cactus poke, however, I would expect it to be bothering him. If it's not appearing to bother him, it's much more likely that its a plugged gland or a stye. Eyelid adenomas (benign tumors
) are also really common and don't create any irritation, but they usually occur on older dogs. Another possibility is a "cherry eye
This link shows the typical appearance of a stye in a young dog's eye
Cherry eyes look like the photos at the bottom of this page...
So, in summary, this isn't likely to be an injury if it isn't bothering him, but the best way to find out for certain what it is would be to have him examined by your local vet. Rest assured most eyelid problems in young dogs are uncomplicated.
Does this help to answer your question?