Buck – not fixed

Male

we have recently taken in this sweet baby. He walked up to us in the woods and no one has claimed him. He's skinny but we have been trying to put weight on him. He is not chipped. We've had him for about 2 weeks now and we named him Buck. He is up to date on vax, and heartworm positive unfortunately but I am not able to do the treatment for him. He is still intact as well. He looks to be a hound mix. I love him so much and he's so sweet and good with other dogs just not sure about cats. My boyfriend has really bad allergies and he's starting to react badly to his shedding, so we can no longer keep him. He also is not used to being inside whatsoever. He wants to strictly be outside and running, as he has tried to jump our fence in the backyard multiple times. I do not want to take him to the pound as I know his chances of being euthanized are very high.