Hunden blir starkare i takt med att den återhämtar sig.

Hunden is the definite form of hund, so it means the dog.

• en hund = a dog
• hunden = the dog

Swedish usually adds the definite ending to the noun itself:

• hund → hunden
• bil → bilen
• katt → katten

So this sentence is talking about a specific dog, not dogs in general.

Because blir means becomes / gets, while är means is.

• Hunden är stark = The dog is strong
• Hunden blir starkare = The dog is becoming stronger / getting stronger

So blir shows a change over time. The dog is not just strong; it is growing stronger.

Starkare is the comparative form of stark.

• stark = strong
• starkare = stronger
• starkast = strongest

In Swedish, many short adjectives form the comparative by adding -are:

• snabb → snabbare
• svag → svagare
• stark → starkare

So Hunden blir starkare means The dog is getting stronger.

I takt med att means something like:

• as
• in step with
• at the same rate as
• progressively as

It connects two developments that happen together.

So in this sentence:

• Hunden blir starkare i takt med att den återhämtar sig

the idea is:

• the dog gets stronger as it recovers
• its strength increases in step with its recovery

This expression is a bit more specific than simple while because it suggests a parallel development.

Because att introduces a clause.

Compare:

• i takt med återhämtningen = in step with the recovery

  • here, återhämtningen is a noun

• i takt med att den återhämtar sig = as it recovers

  • here, den återhämtar sig is a full clause

So when i takt med is followed by a whole subject-verb clause, Swedish uses att.

Swedish often uses den for animals and things when the sex is unknown, unimportant, or just not being emphasized.

Since hund is an en-word (common gender), the grammatical pronoun is den.

• hunden → den

So:

• den återhämtar sig = it is recovering

That said, Swedish speakers can absolutely use han or hon for pets, especially if the animal is seen as more personal or if its sex is known.

So all of these are possible depending on context:

• Hunden ... den återhämtar sig
• Hunden ... han återhämtar sig
• Hunden ... hon återhämtar sig

In this sentence, den is neutral and fully normal.

Because återhämta sig is a reflexive verb in Swedish, meaning to recover.

The sig is part of the verb pattern.

• återhämta sig = recover
• literally, it works like recover oneself

So:

• den återhämtar sig = it recovers / it is recovering

Many Swedish verbs are reflexive where English is not. So this is something learners often just need to memorize as part of the verb:

• känna sig = feel
• bestämma sig = decide
• återhämta sig = recover

Because after att, you have a subordinate clause, and Swedish subordinate clauses usually have subject before verb.

So:

• den återhämtar sig = subject + verb

This is normal subordinate clause word order in Swedish.

Compare:

• Main clause: Hunden blir starkare
• Subordinate clause: att den återhämtar sig

This is different from the verb-second pattern that often appears in main clauses.

Yes, blir and återhämtar sig are both present tense.

• blir = becomes / is getting
• återhämtar sig = recovers / is recovering

In Swedish, the present tense can often cover both simple present and progressive meanings from English:

• den återhämtar sig can mean it recovers or it is recovering, depending on context

So the sentence describes an ongoing process in the present.

Sometimes, but not always.

While can work as a rough translation, but i takt med att is more precise. It suggests that one change happens progressively together with another.

• medan = while in a more general time sense
• i takt med att = as / in step with / progressively as

So:

• Hunden blir starkare medan den återhämtar sig
  = The dog gets stronger while it recovers

This is understandable, but it focuses more on two things happening at the same time.

• Hunden blir starkare i takt med att den återhämtar sig
  = The dog gets stronger as it recovers

This better shows that the strengthening happens in proportion to the recovery.

Yes. Use i takt med by itself when it is followed by a noun phrase, not a clause.

For example:

• Hunden blir starkare i takt med återhämtningen
  = The dog gets stronger in step with the recovery

But if you want to say as it recovers, you need a clause:

• i takt med att den återhämtar sig

So the pattern is:

• i takt med + noun
• i takt med att + clause

Yes. The sentence has a very common Swedish pattern:

• [subject] + [verb] + [comparative adjective] + [expression linking a parallel process] + [subordinate clause]

Here that becomes:

• Hunden = subject
• blir = verb
• starkare = comparative adjective
• i takt med att = linking expression
• den återhämtar sig = subordinate clause

A natural English-style breakdown is:

• The dog
• is getting stronger
• as
• it recovers

So it is a good example of how Swedish expresses gradual change linked to another process.