I mean…the question pertains to making local friends, not friends from other parts of Spain. And difficult to make friends with Catalan people with no Catalan, not impossible. Just a bit more difficult…

In Barcelona the local language is Catalan, and there is a lot of animosity towards Spanish people and the Spanish language. It’s a very hot-button issue.

First, yeah, dogs will make it more difficult to find a place. It’s already very difficult to find a place, so just go in with the expectation that it will be difficult and you’ll already know what to expect. Knowing no Spanish (or Catalan because, honestly, you won’t make many local friends speaking Spanish) will be a hinderance. But, in Barcelona there are a load of foreigners who also don’t speak Spanish/Catalan, so you could always give classes in English. You’re not going to make any meaningful progress in the language in just a few months, unless you’re studying like 8 hours per day. Luckily, fitness is probably one of the easiest gigs to do here, just get a big enough group, head to the park, and ask for donations at the end. Look for immigrant facebook/whatsapp groups and post there with info about your classes. Good luck!