Socializing an aggressive dog?

you should walk them together ... not even let the lab in the house before a really long walk ... do not let them sniff or near each other and walk for at least an hour ... and keep walking ... do not slow or pause for anything (well unless they have to pee but don't let them sniff about, only stop if they suddenly stop to pee) ... when you turn around to head back and the dogs should be a bit calmer at this point, you can allow them to meander a bit and maybye a sniff but just quick and keep moving ... a 2 hour walk is enough to tire most dogs a bit and you can judge what their behaviour is like ... the dalmation should enter the house first on leash and then the lab into the house on leash ... i would never leave them alone together and hopefully both dogs have crates in case they need to be separated ... it is possible ... i work as a dog walker and have had my share of aggressive dogs ... a super long walk and the right introduction works wonders ...