Only if the Portuguese court nominated him as the court's expert. Otherwise it matters not. The dog alerts will just be added to a heap of other circumstantial evidence.
Well, this is the crux isn't it really. There is no evidence that the dogs got a whiff of MBM's cadaver scent, or her blood. AND Grime makes no claims of this. His claim is they did in fact sniff scents which they were trained to do.
As has been mentioned previously regarding pigs. The police or SY may well have the facility to contact the couple who rented the apartment with the Asian sounding name, to ask if they had pig meat in the lounge and bedroom. I would doubt those Asian sounding named persons would be Muslim or Sikhs or Hindu's as they collectively do not eat mean or pigs in particular. So that narrows it down to Christian Asians.
The cross contamination is interesting,however as Sunny says.. strange no scent in the kitchen or patio