The dogs name is Buddy and yes he is very friendly. In fact if you gave him treats he would probably run away with you but my Mother would be very sad. This is private property and the owner prefers no access as in the past, gates have been left open (on the farm) and the lane has been blocked so I'm sure you can appreciate the privacy, being farmers. However, not to spoil your experience of the eye candy...there is an alternative route which you can take by foot to the summit of the pinnacle. All you need to do is from the newline road, take the right after Hayes Mountain Bar coming from Wexford Town, then turn left at the second crossroads. This will bring you around a sharp meandering bend that opens up a vast/baron area. if you park up into the ditch as much as possible (its a narrow road) then walk for a bout 2 minutes from the bend where you'll see a gap on the right hand side. This is a lovely pathway which will lead you up to the pinnacle. (wear wellies in winter and on wet days(obviously). Past the power station and take a left. You can't miss the entrance to the summit :-)!!
As for the name Forth mountain. It is only that. A name. Like the Dublin Mountains ect. They may not be actually mountains but it is a given landmark name for the area and so it is Forth Mountain not The Forth Mountain or The Dublin Mountains. I gave up calling it Forth Mountain for fear of sounding too optimistic to town folk, so I always refer to it as the pinnacle. Hope all this helps.
The views are amazing. The sunrise are beautiful and the sunsets behind the mountains are Gone-with-the-wind-esque in the summer. The moon shines on the ocean at night and between the moon and the shore becomes a sliver lane. To your right are two black dots in the silver sea. they are the Saltee Islands! Tuskar lighthouses torch is so powerful when the farm house sitting room lights are out, the beam shines through the window and lights up the room. Thats more than 10 miles away!!! Linkback: https://mountainviews.ie/summit/1013/comment/4306/