you were given permission to stay in their home, not fuck their dog. stay in your lane. this is considered ownerhopping and is generally frowned upon in the community and actually against the rules of the forum.
it’s also not just something you can just jump into. it can take months or even years to build up to forming a healthy and consensual sexual relationship with a dog. plus, she might even be too young or spayed, in which case your odds of penetrating her without immense damage and abuse are basically zero.
on top of all of what i’ve just said, you yourself have admitted you’re new to this world so you probably aren’t familiar enough with the dog considering you aren’t her owner. so, it’d be very easy for you to miss her social cues, signs of pain, disinterest, and attempts to disengage, once again moving over the line and turning into abuse and trauma for the dog.
to repeat myself, no. drop it. this is not your dog, you have no permission to have sex with the dog, you are not familiar enough with her and neither are you familiar enough to her, and you’re probably still too new and inexperienced to even know how to safely have sex with a female dog. if you continue, you will probably end up hurting and abusing this poor girl, and you could even get caught and kicked out by her owners, in which case add on some sex crime charges and public condemnation to that.