I got no problem with opening a tube up or trenching on for a bigger dog to get up to its quarry might take longer but adleast when it does get to it it has the tools to do the job, some little 7, 9 inch thing would get f*****g smashed by a good sized dog fox, or it would be just chaseing it around the earth all day because it cant hold it. If lads want that crack on but i fuckiing dont, like i said earlier thats my opinoin.