You may be losing trust with someone close to you.
Issues with your friendship or close relationships.
Reveals an overprotective, suffocating relationship.
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.
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.
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.
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 that you can bring you serious problems. In this case your dreamy mind would be warning you that seeking the acceptance of others may have a very high (emotionally speaking) cost.
Now, in this line of interpretation, this dream can mean that your failures or decisions are harmful to your way of interacting with your friends or your partner. Precisely, snake here is not the devil or evil spirits as they prefer to say the Charlatans and farsantes, it is a dream symbol that may be that consecrates the evil in you that is damaging your relationship with your loved ones.
Finally, I invite you to auto-analizar yourself in order to find these attitudes, habits or postures that may be causing problems or initiating conflicts with loved ones. This dream may be suggesting that you are the cause of conflicts or disputes that have been happening to you lately.