Hi and welcome! Hope you don't mind I moved your post here, but this forum is a great place for hearing about similar stories from other Tripawd pawrents (the Rescue Forum is just for listing dogs available for rescue).

You're wonderful for considering adopting this pup. What age is he? I would want to know what kind of accident he was in, if at all possible. He could be dealing with long term issues other than losing a leg, such as orthopedic conditions or possibly nerve damage. If he hasn't been evaluated by a rehab vet, he should be, just so you know what kind of situation you would be getting into. Even if he does have more damage than just the leg lost, he could still be a great companion. Here's what you could expect:

• A front-leg Tripawd will have a harder time going down stairs than up. Keeping a harness like the Ruffwear Webmaster on him will enable you to help him and make stairs, getting out of vehicles, etc., much easier.
• He will want to keep up with your four-legged dog, and can probably do it while he's young. But his physical activity will need to be monitored very closely to ensure he doesn't overdo things and place unnecessary stress on his joints. Walking them together and making sure your quadpawd gets enough activity will be a challenge.
• As he ages, he will show signs of slowing down. A Tripawd's body takes more of a beating than a four legger's over time, but as long as you are conscientious about his weight and activity, there's no reason he can't have a great life.
• Slippery floors are a big challenge. When you unexpectedly encounter them, he may have a difficult time maneuvering. Being prepared with something like Pawz or Ruffwear dog boots is super smart. Tripawds shouldn't slip and slide on floors, it's bad for their joints and muscles.
• A stroller is super helpful for going on longer walks than he can or should do.

I hope this helps. I don't want to discourage you from adopting him, but you're smart to find out all you can before making the move. Let us know what other questions you have OK?

teki said
Have you had experience of a tripawd living with a four legged dog? how did they interact with each other? 

Not personally, but search these forums above for "siblings" or "packmate" and see this post from the Tripawds News blog :

How Do Canine Siblings React to New Tripawds?

If at all possible you want to factor in costs of rehab and conditioning therapy as a Tripawd grows older. Even four legged dogs benefit from this kind of care, but a Tripawd will likely experience more aches and pains in old age, so having the funds to see a certified rehab vet and learn how to do it on your own is greatly beneficial. Costs vary around the country but you can count on at least $200 for a first consult and then ongoing sessions until you're comfortable doing it on your own. A good rehab vet will want you to learn these techniques so you can do it at home and dont' have to come in as often.

Honestly though I really don't think it's any more expensive to care for a Tripawd who is in otherwise good health. The things we do for Wyatt Ray we would do/buy for a four-legger as well. But we only have 1 dog, perhaps others with multiple dogs can chiime in and give you better insight.