Means that you may be losing trust in someone close to you.
Reveals an overprotective, suffocating relationship.
The are issues with your friendship or close relationships.
The dog in the dream world would symbolize loyalty and friendship. If the snake attacks your dog it may suggest that you have lost trust on an individual very close to you. Maybe a friendship is at risk, or you may be having current personal issues with a friend or your significant other.
In some cases, the dream might be indicating that you have realized to be located at the wrong end of an overprotective or demanding relationship. Or conversely, it is possible that you are the one who is suffocating or straining a close relationship (or a friendship) ; as a result, your social relations are being impacted.
Dreaming of a snake attacking your pet means you got problems with a close relationship
Indeed, a snake attacking or biting your pet may indicate that an external negative element (represented by the snake) is affecting your relationship with your best friend, or even worse, your relationship with your partner, boyfriend or spouse.
One of the characteristics of our pets, especially the dog, is their desire to be loved and accepted by their owner. Having said that, we can consider that a dream in which a snake bites your pet, may subtly be saying that your eagerness to be accepted or loved by others can set you up for serious problems. In this case your dreaming mind would be warning you that constatly seeking the acceptance of others may carry a very high (emotionally speaking) cost.
Now, in this line of interpretation, this dream can mean that your personal failures or poor decisions are undermining the way you get close to your friends or family members. Precisely, the snake in this kind of dreams is not the representation of demons or evil spirits as has been believed since ancient times; instead, this reptile is a dream symbol that may embody the evil elements or impulses in you that are damaging your relationship with your loved ones.
Finally, consider the possibility that the snake is just projecting something negative about you, in this case the dream may be suggesting that you, dear dreamer, are the cause of conflicts or disputes that have been happening to you lately. I invite you to look at your self in order to find some attitudes, habits or reactions that may be bringing problems conflicts or issues with your loved ones